They certainly had some of the best villains, I might be taking the easy way out here, but Ba'al was always a favourite of mine.
Ba'al is wonderful. And cute.
He has a LOT of charm. And I love that about him. I honestly really wish they'd just let Ba'al stay on earth, that would have been awesome and hilarious. I think Cliff Simon wanted Ba'al to be an anti-hero/anti-villain and help SG-1 more, so it would have really worked out.
What's your favorite thing about Ba'al?
For me, it's just that overly serious all the time, and is quite happy to make disparaging remarks or two or just plain make fun of the main team. Where the others all take themselves way to seriously, but I suspect after centuries of only really fighting against other system lords and only really having servants to talk to, I think he enjoyed having having someone else in the arena to battle wits against.
I never heard that said before but it wouldn't surprise me which how the role evolved over the seasons.