Brandoloneous
Super Freak
Tough to say. Heroes of Might and Magic was cool until 3DO sold the rights. I love Castlevania but don't like the recent direction it has taken. My love affair with Streets of Rage was resparked by the fan remake but I may be slightly (or strongly) blinded by nostalgia.
I'll go with Team Fortress. With the insane amount of updates TF2 has received over the years, it has always managed to remain moderately fresh.
That Streets of Rage fan remake is awesome. Problem is it was so damn glitchy I could never finish the game