Definitely the best D&D movie, but that's not exactly high praise. I reiterate what someone said above, it reminds me if a Marvel movie. Not as bad as Thor Dark World, but not the best either. A mid-point Marvel movie. Which is a great thing for this movie in context.
Seriously, for a D&D movie that's about as good as you can expect. I'm glad they went with the campy humorous romp, it was the right choice for this movie.
Things I liked:
The easter eggs did not seem forced or out of place (like the two baby rust monsters fighting over a lock)
Holga's ex husband (the cameo)
Justice Smith did a great job
I was never a huge fan of Chris Pine, but he did really good here. Did not phone it in like Jeremy Irons did.
Michelle Rodriguez delivered her deadpan one liners really well.
I am a huge fan of Kenneth Collard since Cuckoo, so it was a nice surprise to see him in a bit part. Wished they would have done more with him.
Things I didn't like so well
Daisy Head's acting seemed forced and off. Which was too bad considering she was the archvillain...
The special effects seemed off as well for the races. Too puppet-like
But all in all I enjoyed it and it was better than I was expecting.