Season 1 will always be my favourite. To me, it really captured the emotion of the characters. Plus I really loved having Francie and Will around.
The first half of Season 2 was good but I think by the middle it started to lose me. Still, it had Irina and I'm happy whenever she's around.
I think I'm one of the few who loved Season 3. I really loved Lauren believe it or not! I would love to see her pop up again but I think it's highly unlikely.
Season 4 didn't grab me. Like most people I thought the stand alone episodes should have been left alone.
I'm enjoying Season 5 so far but my enjoyment is being tarnished by the fact that this is looking likely to be the last season.
In a nutshell ...
Season 1
Season 3
Season 2
Season 4