Strengths & Weaknesses
Everyone hates rogues. They are invisible, come out of nowhere to mess you up, and can do huge amounts of damage in a short period of time. They are the ultimate ganking class, because they can sneak up on people via stealth, and can often kill before the opponent has a chance to react.
Rogues are strongest 1v1 when they get the jump on someone. They are excellent at taking out most casters, but are weak when noticed, and if you can get a rogue into combat before he can stealth, you will have a significant advantage. In battlegrounds, rogues are most effective in AB, where small scale battles, and often single opponents can be found. A rogue can single-handedly take out a node defended by two people, using sap and killing the other. They are particularly weak in AV, where there a lots of players concentrated and more often that not they help each other out.
A very skilled rogue also has the capacity to completely kill someone without them being able to act in any way. This is known as stunlocking, and is difficult to achieve and much rarer than thought.
Rogues suffer from having one of the lowest armour totals of any class. They make up for this by having the highest dodge rate, which can be a disadvantage against warriors, who can use Overpower only when their opponent dodges.

The biggest strength of the rogue is their ability to shut down a player, and for this reason, rogues should target the most dangerous players – invariably the healers. Rogues are exceedingly competent to deal with healers, because they have at their disposal a variety of stuns, and a low cooldown interrupt in kick.
Rogues are also excellent flag carriers for WSG, as they can wait for an effective opportunity to grab the flag and then quickly escape using Sprint. Preparation rogues are arguably the best class for quick flag caps. The idea is to hide, waiting until the speed boost powerup is available. Stealth in, grab the flag, and then use sprint. Take the tunnel, grab the powerup, and when it has worn off, use a Swiftness potion. While running, use Preparation, and once the swiftness pot effect has worn off, use Sprint again. You may also have the speed powerup in your own tunnel. If you time it right, and there are no enemies around to stun/slow you, or dispel your speed boosts, then you can capture a flag before the opponents have a chance to react.
General Strategies
Stealth is an awesome skill, but you need to know its limitations. If you are lower level than your opponent, they have a significantly higher chance of spotting you. You are also easier to see when your target is facing you, so approach from behind. There are a number of abilities which allow opponents to see through stealth, such as Flares, Perception (for humans only) and Catseye elixirs (an Alchemy creation).
Make sure you are prepared! If you are going to engage in what is possible a tough fight, make sure all your cooldowns are up (Vanish, Sprint, etc.), in case things start going against you. Choose your time to engage – the major strength of the rogue is that fights should start on their terms – don’t forget to use this to your advantage. Patience is the key; don’t run in early and waste your opportunity.

Cheap Shot is generally the best choice of opener, unless you have a high damage dagger and are ambushed specced, in which case you can cause huge amounts of damage before they even know what is happening. Cheap Shot also won’t work against a mage, because they can remove stuns by blinking out of them (if you see a mage use blink, then you can open with Cheap Shot, but it requires you to be very perceptive).
Poisons are a vital part of a rogues arsenal. Don’t forget to apply them, and always have plenty of reagents available. Crippling Poison should always be applied – it is the most effective poison against a wide variety of classes. Mind-Numbing is very effective against casters. Wound Poison is good when fighting a healer, or in WSG, where a flag runner will often be backed up by a healer, making them difficult to kill. This is less effective when a warrior is around, as the Mortal Strike debuff is much more effective. If that is the case, use Mind Numbing and Crippling, or Deadly poison for some additional damage.
When you have the flag in WSG, Vanish will make you drop it. This can be bad, but if you are quick enough, you can use Vanish, drop the flag, and then pick it up before anyone else can. Vanishing removes root effects as well as vision effects, so you can quickly break out of Frost Nova or Entangling Roots. It also makes anyone who has targeted you lose their target, which can be very confusing and buys you some time to escape. This is an advanced tactic, and can be very effective if you can pull it off. If you fail, you will look stupid and cost your team a possible flag capture.
Macros
Mashable Stealth
How often have you been to eager to stealth and accidentally pressed it twice, only to find yourself popping out of stealth immediately? It is one of the most annoying parts of playing a rogue. Use this and pressing it when you are stealthed won’t do anything.
/script ic, nme, atv = GetShapeshiftFormInfo(1); if (atv == nil) then CastShapeshiftForm(1);end

Arena
Rogues are used primarily as harasses, and secondarily as damage dealers. Put a rogue on one of the healers to force them to heal themselves rather than other players. They also have an excellent debuff in Wound Poison that further hinders the capacity of healers.
Stunlocking and other CC is an important tool here – especially in the bigger arenas. Other classes are more capable of dealing uninterupted damage (this is where your ranged damage dealers are important), while a rogue can hold down one player with Cheap Shot, Kidney Shot, and Gouge, while having another disabled with Blind.
Cloak of Shadows should be used if you are DoT’ed up. Vanish to get off another opener or to remove a snare. If it comes down to you and another, which may often be the case as rogues are seldom targeted early, you can vanish, hide behind a pillar/under the bridge, and bandage up or eat some conjured food.
The Equip bonus on the Blue honour gloves, which gives your deadly throw a silence effect, is something that should be aimed for as soon as possible. This gives another form of healer harassment, and can be used at range. Kick should be used liberally, and if there is a warrior around, disarm him, which will greatly reduce the opponent’s damage potential.