watched 3 and 4 yesterday too. 3 is entertaining the whole way through, 4 is just a big mess although some of the action sequences are very fucking good.
5 is weak, i think i might still rank it above 2, which to me every part of is laughable.
the first one is perfect as an action movie. he lost his moonlighting swag in the last 2 he just looks like a stale jack o lantern when he tries to smile and wisecrack.