>>357457The first one didn't.
The second was the best, had mountain of unlockables, tons of weapons, characters, the single player had great variety, challenge modes, map editors, at higher difficulties extra objectives, enemies, guns, and content appear, the works.
Other than a wonkey control scheme I don't see how it would have aged poorly at all, it never fell for the "realism" meme so it still looks good, It'd be perfect if it got ported to PC and would have near no downsides.
