My main problem that a lot of times I want to do a raid and not the game but the players won't let me do it. The game doesn't say you need this class or this item level, actually anyone can and encouraged to do it. But then you are there against the boss and another player turns up and kills it before you. "Sorry you not meant to kill this boss, this _our_ boss, go farm something else". Then you are locked out from the instance and scratch your head what to do. That's especially frustrating when you know the other players use a very wrong or inefficient strategy (my strat would work 10x faster!) and even worse: you know those players don't even need the loot from the boss (they can't even equip it or they already have it). So why don't they let others join the fun?