There's four weapons.
I thought it was kind of fun, but the roller seemed waaaaaay more effective than guns and once I played the two maps a couple of times, I was done. Forcing gyro aiming in the initial training mode was a bad idea, but fortunately once you complete it, this can be turned off. The game pad being required makes sense, for once- you get a map at the bottom and can touch your allies to super-jump over to them.