Pandemic's Destroy All Humans, that first game had a great premise...a funny "plot", and interesting locations. The second one was still fun but didn't capture the atmosphere the first game created. Destroy All Humans: Big Willie Unleashed was horrendous, and the Destroy All Humans: Path of the Furon was very disappointing. I made myself sad, was so pumped for that first game...it didn't disappoint but the sequels sure did.
Just realized that was published by the fine people of THQ... what am i thinking no one is going to pick it up if it was availible