Call of Duty: Black Ops? Yes. Blops is a slick rendition of the Call of Duty formula, but by that very note it's formulaic. CoD's cinematic hand-holding can't hold a candle to Bulletstorm's progressive, densely interactive invention in terms of game design or laughs per minute. By comparison, its core combay feels like playing an RTS with only one unit. Blops does, however, have much more expansive multiplayer options.
Gears of War 2? Not better in every respect, no. But if you're serious about your shooters, you really do need both. They're great companion pieces in a way, in that both games are completely successful in fully exploring an individual approach to the shooter genre. Gears is the more superficially serious game, but Bulletstorm can match it in terms of scale and engaging narrative. Gears's tightly designed co-op campaign gets it extra points, but Bulletstorm's sheer depth and scope levels the playing field.
Killzone 3? Yes. Killzone 3 does a great job of fixing its predecessor's problems, and is a deliriously-paced visual standout for FPS, but while it certainly progresses its series, it doesn't progress its genre. Bulletstorm does. It's a genuine creative evolution, pulled off with intelligence, depth and flair, and as such is a more special game.