I got the game on the Nintendo eShop. It certainly is interesting.
The regular single player mode is very interesting an rich in content. Most of it is just simple missions that can take a short or long amount of time. I thought that the game mechanics in the trailers would feel cheesy, but I enjoy the way everything fits together.
The online mode is fun and sometimes hilarious. When you're on a team of 4 and 3 people are dead and 1 is idle, it makes for a hilarious 3 minutes. The different modes, difficulty levels, and stage counts change the bar on how hard, easy, or long you can play for.
For now, the only complaint I can make is that the cinematic cut scenes have a low frame rate. Does this happen to anyone else?