I've heard from a bunch of people that Dark Angel season 2 wasn't worth watching. Well, it had its flaws -- it was no Battlestar Galactica by any means -- but Steph and I both enjoyed it immensely.
I think part of the reason people had problems with it is that it drastically shifted gears. Season 1 is all about Max, her life in Seattle, coming to terms with her past, and being on the run from (essentially) one man (who represents the Manticore Project as a whole). Season 2, on the other hand, changes all of that. Certain Big Things happen, and the rest of the season is spent exploring the consequences of those actions, both those Max has taken and those that were forced upon her. The Familiars plotline wasn't quite as polished as it could have been -- okay, it was downright hokey at times -- but the rest of the season more than made up for it.
And for all that Normal was a pain in the ass, he completely redeems himself at the end.