You have to check out "Pacific Rim." It didn't do as well as expected when it was released, but it's such a love letter to giant monster and mech films. The action sequences are jaw-dropping, especially the battles in the city, the choreography really captures that chaotic yet exciting feel of a real fight. Plus, who can forget the practical effects and the amazing design of both the Jaegers and Kaiju?
Another one is "Scott Pilgrim vs. The World." It bombed at the box office but has grown into a cult classic thanks to its unique style and energy. The way Edgar Wright blends video game aesthetics with fight choreography is just brilliant. What are some of your favorites that fit this mold?