Saw it today. Some really hilarious scenes!
I thought the movie had a lot of heart, each character got to show some sorrow as well as humor. I'm going to see it again before I pass any real judgements. Something made me like it a lot, but I also was very aware I was watching a movie-- more than any other Marvel movie. It might have been my mood or the specific theater, so I'll give it another shot with my wife.
As to Marvel/DC I am simply enjoying the Marvel movies much more because the DC ones have gotten so damn dark. The Marvel movies can be dramatic, but also fun. And that's what I am looking for in my comic movies.
Now for some specific movie observations:
Loved the CGI on Rocket. Especially when he wakes up in the prison and the hair on half of his face is all smooshed in. Even Racoons can have a bad hair day!
They didn't really do much to build up Thanos in this film. If he's such an intergalactic threat, all they have done to prove this is show that he has a space throne. I would hope that they build him up a bit as we move towards Avengers 3 and show us why people fear him. Because for the non-comic person they have no knowledge of how powerful he is. In the MCU, does he even have any of the infinity stones? 1 is on Asgard, 1 was in the Collector's museum, and now the third is with the Nova Corps.