which game?

ok since im taking a break from mmo's for awhile im considering buying a 1p pc game.also since im working on my ds rpgs i wanna get something out of the rpg aspect in hopes maybe ill come back to online rpgs.my choices are lord of the rings conquest,left 4 dead,and diablo 2(its something).im sure my pc can run all of em.now ive played diablo 2 many years before and many times,and ive played l4d on xbox 360 but i havent played conquest yet.bad thing is ive heard l4d and lotrc arent worth buying and whatnot and i dont wanna spend days downloading them.

L4D - Is pretty cool, I mean I didn't play online but I played it, its pretty good. (I reccomend getting Resident Evil 5 for Xbox360 instead of L4D for the PC tbh)

LOTRC - I also heard some negative shit about this, that the multiplayer was bland. But it reminded me of (And because it is like) Battlefield 2 and SWBF1/2.

Diablo 2 - Win.