Very good. I agree, 1&2 are terrific. The next couple, not as good because the on screen chemistry that moved off (during 3), move out and there was some lack of the old spark. Some of teh story lines got looped around a bunch as well and no real direction apparent to the fans.
5 works okay but the last couple of episodes, especially the middle part of teh last show, redeemed much.
Definitely worth watching.