Saw it for the second time on Sunday, taking my son this time. We both loved it, and I liked it better the second time. The points that bothered me the first time still stuck though.
I was certain that Loki somehow tricked Thanos and the rest that he was actually killed to be able to be hidden behind he scenes and work his magic. That means that Loki really was pretty much unceremoniously killed off. I know Loki taking the Tesseract means he's still alive in a new timeline...still lame. I must also say that everyone and their Grandmothers picking up and handling the Infinity Stones, not to mention the whole Gauntlet, was quite annoying.
Still enjoyed the heck out of it!