It was pretty decent. Ronan was very underwhelming and I didn't like the fact that they made him the primary antagonist (because he's not really a bad guy), and they didn't utilise much of the Universal Weapon's potential, probably because the remedial populace would compare it to Mjolnir.
The worst part of this film was the Nova Corps by far, they don't fly, they don't have any abilities, they don't do anything! I didn't grow to love Drax, I thought he wasn't a strong as he should have been and I agree that Gamora wasn't portrayed as being deadly enough.
Benecio Del Toro's character was completely off in comparison to how he was in Thor: The Dark World, so he made no sense.
All that aside, the movie is pretty enjoyable though. Not Avengers calibre but a solid effort.