Roswell went "south" because of the WB. Unfortunately, WB thought they had "better ideas" than the writers of the show for the start of the second season. Season 1 was perfect. Season 2, while good, felt MUCH different from the highly rated Season 1 and it showed. So you can thank the WB for Roswell's low ratings and cancellation. If the writers were allowed to continue their original thoughts, I can almost guarantee that we would have see a Season 4 and 5, if not more.
UPN did us fans a favor by picking it up for a third season, but unfortunately the damage had been done.....

Not even UPN could help that.
For what its worth, I LOVED
Roswell too. And honestly, I put it right up there behind
Buffy and
Angel. Roswell certainly held its own, and while I wish some things turned out differently, I'm still glad I got to enjoy the experience. But, everything happens for a reason. It was a unique show with a concept and likeness that I doubt we will ever see again. The characters and their relationships were what drew the audiences in, including myself. Mix that in with an extra-terrestrial twist, and you have one amazing show, hence the success of
Roswell. That's one show I won't forget.
I take it you were a big Nasedo fan, Nasedo?