What game this gen IYO has the best replay value?

I have to easily give it to Oblivion, there's just so much packed into this game.

Crysis and Mass Effect are the only single-player games this gen I've even bothered to play through more than 2 or 3 times.

This. Multiplayer.

TF 2, Sins of a Solar Empire, HoMM V

As far as the campaign goes, the only game I have played twice is NWN 2 : MotB and Crysis (till Pre Alien Levels)

ArmA is up there.

Anything with a Flashpoint esq editor should be.

Oh and the Orange Box for sure.

edit*

Oh and its been said but:

Sins of a Solar Empire

Crysis

I have to easily give it to Oblivion, there's just so much packed into this game.jharv

I'd have to agree. That game coupled with the expansions sucked up ALOT of my time early on this generation. I thought fallout 3 would have similar effect, but it turns out the game was a little too shallow and lacking in diversity for my tastes. Oblivion still holds the crown.

Halo 3

SSBB

I play both months after there release and both of them are still amaizing