You could try Cyberpunk 2077, Dishonored 1&2, Prey before giving any money to Ubisoft. + Half-Life 2, BioShock trilogy, Fear if you want more action.
If you aren't against rpgs go play Dragon Age:Origins, Mass Effect trilogy or Baldur's Gate 3. Or Alpha Protocol ?
If oldies doesn't scare you : Vampire Bloodlines, Deus Ex, Half-Life, Baldur's Gate 1&2, Planescape Torment, Thief 1&2, and some point'n click games also...