I've seen a lot of people complaining about missing platforms, or invisible void zones...maybe we've just been lucky, but we haven't encountered those problems yet.. (betting that next week, because I made this post - we will have missing platforms )
The aggro wipe on mind trap cast was a surprise when we hit him last week, that's something you can rebound from (as stated by the OP).
I really hope the next op, or ops after this one require some sort of "attunement) - like when you had to do SSC, TK and Hyjal to get into BT in WoW.