UPDATE
So I hit level 30 and everything is great now. As many have mentioned here Rogues have it pretty tough until you get more abilities. Vanish was pretty huge for me. BGs are a blast, except for Hunters. Hunters can go die in a fire with their ridiculous CC and escapes.
END UPDATE
Ok, what am I doing wrong? I have hierlooms weapons, chest, legs, and cape and I'm getting absolutely wrecked in BGs. I'm only level 28 at the moment but it just doesn't feel right. I open on targets out of stealth and it feels like I have zero burst. At these levels people have around 2500 hp and I'm lucky to deal 500 on my opening burst, let alone hope to kill anyone. I'm combat right now, so I open with Ambush, Revealing Strikes then SS spam or finish with Eviscerate.
I can go into more with Armory or the like, but I'm just wondering if anyone has any tips for me without getting too detailed. I see other Rogues do well in BGs and it's gives me a sad. Help!