I spent a long time thinking about this and ended up with like 20 games to mention. I don't have the energy to rant about all of them though. x) Most of them were more overrated than underhated too.
The 3rd Birthday gets my vote for an underhated game. It already has a mixed reception as is, but it deserves worse. The gameplay, music and graphics were all solid, but the story and characters just took a gigantic shit over everything. I do feel gameplay is generally more important than story (unless the story is exceptional or at least very solid) in video games, but The 3rd Birthday's story was just insulting garbage to an overwhelming degree. Time travel stories are tricky to get right in general, but the devs did an exceptionally bad job at it. It's just a gigantic confusing and convoluted mess of pure garbage. Did the devs think it was deep or something? That happens a lot in plots, the tendency to think something is complex, but is just a convoluted mess in reality. Final Fantasy Tactics has a complex story, The 3rd Birthday has a convoluted story. Big difference.
The overall entire assassination of Aya as a character is the worst part. Yeah, I know it's Eve in her head and that's who you play as the whole game, that only makes things worse. So it's a really bad time travel story, a really bad Freaky Friday story and a really bad amnesiac story. Three strikes and all. Really great to have to, literally, kill Aya at the end as well. Why the fuck did any of this happen in the first place? The whole lynchpin of the story is Aya and Kyle getting gunned down at their wedding by SWAT members. Okay, I still don't know why that happened. If anyone has any idea, please tell me. I don't want headcanon or anything like that though, I want an actual verifiable reason. As far as I know, there is none.
I'm just gonna stop there. I have other complaints, but I think I got my feelings across well enough. I don't know who is to blame, Motomu Toriyama, Hajime Tabata or Yoshinori Kitase. In reality, all of them I suppose. They work together a lot and they don't tend to make good products. It's a shame that Hironobu Sakaguchi isn't around to keep them in check. At least Tabata isn't at Squeenix anymore, that's one less shit covered finger in the pie.
These two were on my list as well. Don't have much to add other than well put, both here and in your subsequent posts about them. You have become more than my HM slave, I am proud of you. I would also put Tears of the Kingdom next to Breath of the Wild. I'd actually put it below, honestly. I played BotW enough to climb all the Far Cry towers, visit all the villages and take on two of the Divine Beasts, but I only sunk like 10 hours into TotK before I was done for good. Glad I didn't buy any of them in the end. x)
I guess I'm feeling a little spicy, so I'll do a couple rapid fire ones.
Skyrim is mid to bad in almost every metric. They've even re-released it 500 times and never fixed any of the numerous bugs the game has. I will never fathom how it's considered one of the greatest games of all time. Even mods aren't enough to salvage it.
I'll give it a point for being really ambitious for it's time, but Omikron was not a good start for David Cage's career. He started off near the bottom and has taken about half a step up with every subsequent game. Detroit was even tolerable, though that was mostly because of Connor. I know David Bowie and some of his music is in it, so people seem to feel it should be treasured because he's gone now, but a bad game is a bad game and Omikron is somehow the worst of Quantic Dream's rather stinky library.