What's a game you enjoyed as a kid that you didn't know people hated until you started posting on the internet?
For me it's:
Dynasty Warriors. I can see how people would be burned out on the series and maybe I got into it late (around DW3) but Dynasty Warriors is a great split screen co-op game to play with a friend.
Metal Gear Solid 2. The Raiden switcheroo really didn't bother me that much. I really wish more games would introduce new protagonists into their games instead of sticking with one iconic mascot. The codec calls and Raiden's character were all fine to me.
Chrono Cross. I played Chrono Cross first and I initially bought it because "hey this looks like it could be like a cool Final Fantasy-ish game." I really enjoyed it. I can see how it would be a disappointing sequel, but I think it's a good game on its own.
Really, JRPGs in general I didn't know had so much disdain directed at them. But I don't know if people hated them when they were released or if the internet just amplified the hate. Like, everyone expressing their love of FF7 with tons of fan art, avatars, signatures, music videos, xXSephirothXx names. And the people who didn't care for the genre felt the need to push back even harder against the people saying how much they liked it.