Season one of this show, despite poor ending, was a delight. I didn't totally resent season 2 either, but beginning in season three, things began to fall apart, then season four and five were of the nature of being a rough and boring ride till the very last few episodes where it almost makes you feel like there might be hope.
In the end though, I feel my time is better spent watching George Romero's original zombie trilogy, and calling it a day.
Also as a side note, the whole "community" episode has to be the worst yet. Cliche, and utterly trite.