So:
-ManHunt needs a crack to work. It's still not available in some countries probably due to censorship.
-GTA IV needs several workaround to "work": the result is still not guaranteed, because a lot of people, like myself, can't even boot the game on Win10. It has Securom. R* also removed some tracks from the OST.
-L.A. Noire is not patched for Win10 and a lot of people can't boot it at all. The game recently had a remastered for console. Originally the game was sold as a single app containint both the vanilla game and all dlcs. Later R* decided to split the game, so you need to buy the vanilla title plus all dlcs. The dlcs are only in the third tier, while the base game is in the second
-GTA Vice City has almost ten songs removed from the soundtrack
-Max Payne 1 not available in some countries because the game has region specific versions, and probably Rockstar or Humble didn't bother to distribute keys for the different countries, and the only version available should be the ROW one. It uses a crack Rockstar "got" from the Internet to work.
-Bully has problems with Win10, despite on being a bad port. It crashes a lot, Steam overlay doesn't work.
-San Andreas has some tracks removed from the OST.
-Episode from Liberty City has pretty much the same problems of the original GTA IV.
Yeah, good value. It's like R* is trying to do easy money by throwing away their shovelware since they didn't bother to upload those games and solving the issues, despite having bilion of dollars.
Eeew. Thanks for the head's up!