Did you rent the rest of Season 1 on DVD, mole?
Both are great, but they have their strong sides.
Season 1 was written MUCH better than season 2, IMO. Far more personal with Jack and his family, which made it better to watch.
Season 2 had more of a shocking story to it, which added something, but the personability of Jack was gone. Since he was colder and more distant, it was hard to rationalize with him on a lot of stuff that he did. You know he's the good guy, but you're left with a "WHAT THE FUCK!?" a few times.
I prefer Season 1 over Season 2, and hold up the first half of Season 1 to almost any first season of any show ever made and say that it's just as good or better.