Breaking the rules a bit, but Dying Light's made Dead Island completely useless to me. Same combat and general feel, only drastically improved, and you know, they really enhanced their player movement.
Middle-earth: Shadow of War was such a giant upgrade that I'm sure replaying Shadow of Mordor will be tough.
Left 4 Dead 2 includes enhanced versions of the L4D1 campaigns, so like most people, I have no need for the first game.
Star Wars Battlefront: Elite Squadron on PSP has customization, a real campaign, and huge battles that take place across both land and space. It's only a little disappointing to return to Battlefront II on PC (where at least I get to use a mouse again).
I dunno, often I prefer the first entry. Sometimes I'd say it's the sequels I can't play.