All of the seasons are pretty good to me. In my opinion, it's great to just start from the beginning and watch the evolution unfold, but I think the best seasons to watch independently are 4 and 7 just because there are so many queens with their own exciting personalities.
Season 2 for drama, season 4 for gags, season 5 for good storylines, season 6 for some of the biggest drag queens to come out of the show :P Season 7 for great looks, and if you liked Katya in AS2, this was her original season as it is Trixie's from AS3 :P
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