What encounters specifically are tripping you up? I'm not talking about wiping once or twice to learn it, I'm talking about even after a few attempts, when you DO manage to down the boss, it's only barely.
Complaining that you can't save stupid players from being stupid is pointless, that's not going to change (and it's wonderful that stupid players are dying now).
The third boss in Shadowfang Keep is where I've had trouble so far. Not a whole lot else after figuring out the mechanics. I've heard Throne of the Tides can be bad but I've not done it yet.