With so few good new titles being released these days, especially by major studios, I figured I'd make a thread for everyone to share your favourite classic or older games, especially if they're lesser-known titles that others might have missed at the time.
I'll open with The Saboteur (2009), Mercenaries (2005) and Saints Row 2 ( The 2008 original)
If you're into strategy games then definitely Rome: Total War (I), the 2004 original, as well as Medieval II Total War from 2007. Aside from the base games themselves they have so, so many mods as well (helps that the old engine is more moddable, especially map-wise, than the new engine used by the series since Empire), including some which are being worked on even today.