Two answers from me.
First there's Smackdown. While Smackdown 2 is the only game in the series that has the casket match, removed from future games, each game in the series was better than the last. It wasn't until they changed the series to Smackdown vs Raw and tried some new things out that the series started to suck. They took all of the games features away so it was pretty bare bones, and the mechanics were worse. They wanted it to be realistic, but they didn't make a good realistic wrestling game until WWE 11 or 12.
If you don't count Yakuza Dead Souls which is a spinoff and isn't like any of the rest of the games, and if you take Yakuza Black Panther as it's own series(never played it,) then there's also the Yakuza series. Every game, atleast every one I've played 1-4, is better than the last.