The RE2 remake was nowhere near as lacking as the RE3 one though. You technically had 4 different campaigns with 1st run and 2nd run for both characters. Even though they were 90% similar, they gave you a reason to play again. It also had the 4th survivor with HUNK and a couple other survival modes too. I didn't mind the lack of Mercenaries since the original 2 never had it but 3 not having it was criminal when the original introduced it and the game was already severely lacking in postgame content.
As for RE8, I hear its longer than RE7 which is good. RE7 had nothing postgame beyond the free Not a Hero DLC. The rest was paid DLC which wasn't worth the money. Still wasn't as lacking as 3 though.