Games that are generally considered the peak of their series that you thought were overrated or other games were better.

[OlfinBedwere]

Sonic the Hedgehog 2. Still very close to the top of the pile for the Sonic series, but I think it suffers from the last few stages being a bit too difficult just for the sake of being difficult, and the special stages haven't aged at all well. I think 3 & Knuckles and Mania are both better.