Bungie, Twice tonight did the Legend Seraph bug out and not allow us to continue. Right before the open room with Briggs. Also, no crouch/rift function, which is really handy. Nothing like wasting 2 hours for nothing, on an already endless grind of a game. You own it - fix it.
I've read that you should wait to open the doors until cut/audio scenes are done. I've only had one door that couldn't open once about halfway through. Had to go to orbit once. Not sure where. I haven't had a problem but I know other people have.