I thought it was a pretty good movie. It may be the darkest saddest marvel movie thus far. Which, if you ask me, is long over due. Yes they are a fun loving quarky group of friends. But bringing some real pain.. some real tragedy to the characters was a beautiful way to find out why they were the way they were.
I admit I would have liked to see at least some of the guardian characters actually killed off. As sad as that would have been I think we would remember their sacrifice more profoundly. If this is truly the end, then let's end it with a solid period.
Over all I would watch again and recommend.