Personally I prefer Cabal, with it's semi-destructible scenery (did Op Wolf have that too?), tho' it's 3rd-person rather than FPS.
Cabal is cute (Op Wolf was "just shoot the moving objects"), but now I'm getting crap at playing games due to old age (32), I'm finding Cabal more and more annoying to play - especially with the end-level bosses.
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(You can tell I'm working on the 1988 chapter, can't you? ;))