My personal experience with IW was underwhelming - you're completely overpowered for the entire game until the last stage, then you keep running out of ammo because melee is unusable (exploding enemies and all) and there just wasn't enough ammo, especially with the silly universal ammo and the low limit on what you could carry.
Picked up Silent Storm: Gold, which includes the sentinels expansion for $20. Been a blast, though really, it's a shame in so many ways. Lots of fun, and a very impressive engine, but both games suffer from pretty big flaws in game design. Really wish they had completely omitted the PanzerKlines. Too bad, because blowing a door to pieces and the guy behind it to pieces to never gets old. The engine itself absolutely screams for a well done fallout style adventure - I had hopes for Hammer and Sickle, but given the reviews, it looks like they mussed that one up too.