Let's give props to those games truly forgotten, or maybe reviled, by others, that we loved.

No "Oh, I'm the only who likes Assassin's Creed/Call of Duty/ etc.", c'mon, no games that routinely sell millions of copies; and don't name a popular old franchise like Commander Keen, or Duke Nukem, and pretend you're the only one who remembers it.

Dig deep here people. Tell us about that game everyone hates, or no one knows it exists, and tell us about how great it really is. Different opinions are fun, so let's share them.

My pick is True Crime: New York City. I wasn't a big fan of shooters at the time and this game, unlike most GTA clones, actually leaned a bit towards being a brawler, allowing you to learn different martial arts. You could be a good cop or a bad one, and plant evidence. It wasn't quite as crazy as GTA, but it tried to be. You had Christopher Walken as an eccentric FBI agent, and you had missions like storming a record label, going to the top floor (which just so happens to be a japanese garden), and having a swordfight with a rapper in a samurai armor. If I wasn't the kid I was when I played it I doubt I would have liked it as much as I did, still, I don't think I've ever seen a positive opinion about it. Hardly a masterpiece, but I do have a soft spot for it.

Blood 2
Heroes of the Pacific

[PROTOTYPE]
Mirror's Edge
Revenge of the Titans

Game of Thrones - the RPG.

I enjoyed the story and reckon it has more gameplay than the recent telltale games.

Alpha Protocol. I had great fun with it, with the story, dialogue and mostly unique mix of action/spy genre and RPG.

Reign: Conflict of Nations

A small realtime/tbs empire building game by Lesta Studio (now working on World of Warships for Wargaming). Basically you play one of princedoms, fiefdoms, kingdoms between 1300 and 1600 in the east. Basically the area of Poland, Russia, Ukraine, Baltic countries, etc. Its a game that brings a lot of different concepts together. Diplomacy, war, spying, plagues, rebellions, religion, etc. Its a game that demands a lot of attention which is why most people dropped it fast and downvoted it. Definitely a very good game but needs a lot of concentration.

In terms of games that everyone hates... Daikatana easily...

Yeah it came out in a mangled state, it has a lot of stupidity in it that is not just the AI, but you know... considering what it is when it cooperates, it is a rather fun FPS game that is essentially Quake II with some minor RPG elements that tried the whole AI team thing when it was still new. I even say that with the opening Tokyo levels too, those levels aren't as bad as people make them out to be for me. The toxic green sludge look of it is strangely appealing for some reason, it has that Voodoo graphics color to it that makes it look kinda rad in a dreary way. Also with the 1.3 fan patch, something I always plug with this game, it is far more playable than the previous versions every hoped to be. It may not have been what was promised but for what it is, it's a pretty decent little package that has some charm.

For something that barely anyone has played, an obscure South Korean DOS game known as Eojjeonji Joheun Il-i Saenggil Geot Gateun Jeonyeok...

It's a licensed game based on the comic of the same name, while I know jack about it, I do know about beat-em-ups and this is an exceptional one and that is amazing considering this is still a DOS game after all. DOS is not know for having decent beat-em-ups. What makes it stand out though from the rest is the crazy amount of moves you can acquire when you get farther in the game and being able to pull those off on stages where it is not uncommon to have 8-10 guys on screen is incredibly satisfying. Did I mention this is all in a DOS game?

Strike Fleet!

Witchaven and Witchaven II

If you'd asked me a few years ago I would have said ADOM, but apparently roguelikes are a huge deal these days and I imagine a lot of people have heard of or played it now...

I have to say my tastes have always tended towards the highly rated (mainly because when I could only afford to buy one game every few months I damn well made sure it was a good one and that usually meant buying highly rated titles) and there less obscure games I've actually played...

I suppose I could say something like Dynasty Warriors (though I'm hardly the only one that likes it considering it must sell millions to still be going at the rate it does) as it's a series often slated for being boring and repetitive but that I have always quite enjoyed.

Dark Vengeance (PC) I remember that game not getting great reviews and I picked it up from a bargain bin so....

Edit: Oooh and Toejam & Earl 2 Panic on Funkatron (and 3 for that matter) neither were nearly as well received as the original but the 2nd is my favourite.

Shadow Ops: Red Mercury, perhaps? It wasn't very well received by reviewers at the time and then was quickly forgotten about, but I really like that game a lot.
Night Dive have re-released it on Steam, and I hope they'll bring it here, as well.

Then there's Space Tanks, which is simply really, really obscure. It's now available as freeware, though.

Fountain of Dreams (a semi-sequel to Wasteland by EA). I admit it was pretty poor but it was my first ever CRPG and to this day I still fire it up occasionally for a bit of nostalgia.

Zombie Smashers X2: Punx and Skins :)