What do you think are some video game franchises which with it's first instalment seemed great/refreshing, simply good but then got worse as new releases were added ?
In my opinion, Kingdom Hearts takes the cake. The first one had a great atmosphere and setting which imo worked marvelously and really drew me in, the gameplay was engaging, fun and challenging. It remains one of my favourite games of all time.
However next came the later instalments which drained the game's heart out with it's catering to fat yaoi fangirls, forced and random overly weeaboo characters, lame button mashing combat (press triangle to win now !), linearization of level design, complicating a vaguer more symbolic plot into complete nonsense...it's just so sad to see a concept which you fell in love with get fucked over so bad.