Overall, probably Max Payne.
Then, definitely the Batman games (Arkham Asylum, City, Origins, probably Arkham Knight too).
Then GTA III, VC, SA if it counts as trilogy -- people already are mentioning them so, I agree.
Honourable mentions:
- Monkey Island 1,2,3
- Uncharted Series
- Gabriel Knight 1,2,3
Resident Evil
Silent Hill
Halo
Onimusha
Megaman X
Doom
Metal Gear Solid
Devil May Cry
Castlevania
Tekken
Street Fighter, Alpha , Ex
Soul Caliber
Smack Down
Twisted Metal
God of War
Gran Turismo
Assassin's Creed
Dragon Ball Z Tenkaichi
Heretic
Deus Ex
And many other games.
The first witcher game is rough to play. Not just gameplay/combat but story has weird pacing and doesn't feel like a game about a witcher at times.
Dark Souls 2 gets a lot of hate but that game kicks ass. some bosses were complete push overs so i wish they were more challenging and the controls/combat mechanics feel strange at first but otherwise the game is a load of fun.
Witcher
Big Boss Trilogy (3-PW-5)
Stalker (SOC, CS, COP)
Dark Souls
Warcraft
Mass Effect (Quality aside. i think this is the quintessential game trilogy)