I would still watch in order, as I like to see how drag develops and changes.
I think all series have redeeming qualities even S1 as it was the first ever and raw. The queens didn't know it had the potential to make them famous (in contrast to Silky hamming it up to the cameras to bag a spin off).
Also in newer seasons (can't remember when they started doing the big crowning of the winner in front of large audiences - I think 5 or 6?) the previous winner crowns the next one so you will end up spoiling any surprises you may have left!
Looking forward to the lipsync knock out though!