Thieves should be hard to catch and kill and Anet gives them a lot of skills to help them which is fine because they can go down fast. My issue is when you use an elite control skill to catch them and they can shadowstep out of it then why bother. I was on a ranger and the thief was five feet from me fully visible and I used entangle skill. I rooted him and within one second he was out of the root and invisible and on his merry way. Supposedly you have to destroy the roots to get of them but he just stepped out of them. I was told he shadowstepped away. I have been able to root some other thieves and kill them with entangle. Stun and cripple they can usually shrug off as well. I think the issue is when you have five people trying to chase down a thief and they can’t see him or root him or stun him that people question the lack of any real balance in the game with thieves.