Season 1: awesome, a lot of great violence, fighting and survival stuff.
Season 2: almost completely ruined, crappy scenes, and WAY to many problems to keep track of with little to no action. There were some episodes were they only killed 1 zombie! Also, it ruined all of my favorite characters except t-dog and Daryl, who never get any air time.
Season 3: better have some better explanations and fighting/zombie killing