Honorable Mention: Heroes - Season One

Sylar not only has the evil genius serial killer act down pat, but also the wardrob
Heroes was the television equivalent of Biz Markie (that is a one hit wonder).  While the second season was underwhelming and the third an unmitigated disaster, Heroes first season was a huge hit.  The first season managed to simultaneously balance a "real life X-Men" approach with comic book campiness and the result was thoroughly entertaining television.  Masi Oka became a fan favorite as Hiro Nakamura, the Peter Parker of the shows heroes.  But the real scene stealer was Zachary Quinto (who more recently portrayed Spock in the new Star Trek) who played the primary villain of the show, Sylar.  Sylar had the same vibe as the Heath Ledger's Joker in Dark Knight; a brilliant, twisted force of chaos that some part of you kind of liked.  Like Ledger's joker, you knew something bad was going to happen anytime Sylar was on the screen.

Additionally, the storylines for Peter and Nathan Petrelli, Isaac Mendez, Claire (Hayden Panetierre) and Noah Bennett, and Hiro & Ando were all very strong.  Really the only storyline that dragged was the Nikki/D.L./Micah storyline (we get it, Nikki has split personalities).  The finale, which seemed to be building to an epic showdown between Peter Petrelli (the show's major protagonist) and Sylar, ended up being somewhat anticlimactic, which was a harbinger of bad decisions to come.  Still, the first season of Heroes, while not quite top 10 worthy, at least merits mention.