Nightshade (Shinobi series) thos this series has more than one. I honestly don't get why it was shat on. It's a damn good game. It plays just as good as Shinobi 2002.
Splatterhouse 2010. As a fan of the series, this got shat on. However, when you play it, it's a fun beat 'em up. It's a 3D brawler, and it's just a 3D Splatterhouse game.
PS2 Contra games. Shattered Soldier & Neo Contra. I think these would be well liked today, and people are coming around on them. Just the environment they launched in people and reviewers were not as accepting.
Every single 3D Castlevania are good games. The N64 was ambitious but came post-SOTN, so it was doomed already. Its worst aspect is the camera, which is what most 3D games suffer from. Lament is great. Curse is great and the LoS games are good.
Gears of War Judgment. It's fine. It plays a little differently with the controls. But it's more or less Gears. Feels like DLC rather than a full game so maybe at full price it was a letdown. Buy it for 10 bucks more than a decade later, and it fills in the need to finish every Gears game.