I just watched the movie last night, and I thought it was enjoyable.
The main cast had great chemistry with one another, and I felt that their interactions flowed well. I thought there were some pacing issues here and there (parts of it dragged a bit, while some others seemed to come about too suddenly). I do think that some scenes and gags could have gone better perhaps with some reactions shots, and that a couple of the running jokes could have been pared down a little to preserve the overall pace of their scenes. The final confrontation was pretty cool.
I really liked that it had a different feel from the original GB and wasn't just a retread with flashier special effects. It was a treat to see most of the cast of the original GB in their cameos.
Overall, yeah, I though it was a nice movie. It obviously sets up for a franchise, so I'd go watch the sequel.