Any good Single player game recommendations

I massively enjoyed Just Cause 2, should last 20+hours to do the main game i think

but most people i know think the game is repetetive (and in terms of mission, it kind of is. but i just love the dang huge open world)

i hear the far cry series is pretty good

Stalker

Morrowind, Oblivion, Skyrim, Fallout 3, Fallout New Vegas take your pick all good SP games

The 仙剑奇侠传 series and the 轩辕剑 series.

mark of the ninja, not open world but it's amazing

What.
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Anyway, try Oblivion or Fallout NV.
If you're looking for something less intensive, try Bastion.

Deus Ex.

As has been said you can't go wrong with Just Cause 2 (keep your eyes on this site too) / Elder Scrolls games / Fallout games.
I'll add Assassin's Creed series and Driver San Fran if you like driving.

Mass Effect 1 & 2, Dragon Age: Origins, Deus Ex, Spec-Ops: The Line (not open world but has a great story), Bioshock, Mafia II..

I would suggest Batman Arkham City or L.A. Noire they are both good, with fair length storyline and open world.

The Borderlands, Batman, Bioshock & The Witcher franchises are all good SP games

Uh, Max Payne 3, Alan Wake and CoD Modern Warfare Trilogy are great.

System Shock 2 was recently re-released on gog.com.

Mafia.The old one, of course.

fallout series, elder scrolls series(these first 2 are most def open world), bioshock series, Bastion is pretty good to

beyond good and evil

you have my avatar...again

mass effect, witcher

Darksiders I + II

Bioshock! :D

Mass Effect, Witcher, Fallout, ElderScrolls, Deus Ex, Knights of the Old Republic, Just Cause 2, GTA4, L.A. Noire, Borderlands, Dark Messiah, Dragon Age, Beyond Good and Evil, Bioshock and many more....