I enjoyed it as well. Sure, it was no Requiem for a Dream, but who the hell would go into an action movie expecting a theatrical masterpiece in that way? Action movies are not about astounding acting, and most of the time they're not about intelligent plot twists. What it all boils down to is robots are cool, robots going haywire are cooler, and explosions while robots go haywire are even cooler
It was a fun, entertaining movie with minimal intellectual value, and that's precisely what I expected.