I had a very similar experience yesterday; managed to find 6 people (all Xbox friends) to take the raid on. Unfortunately 2 of them had already completed it several times so I ended up crouching in a corner with 4 other people while those 2 glitched the last boss. Not what I had in mind, I have no problem with people taking advantage of what I am sure will be fixed fairly soon. But it's not why I play the game. Would like to give mad props to the level designers, the parts we did properly were challenging and enjoyable.