I luv season 2 the most! Its always been my favorite, partly cuz its what hooked me on this show in the first place, the Scoobies all together, the incredible storyline of Angel turning evil, Spike and Dru, and Buffy sending Angel to hell then leaving town, it just rocked
My second fave is season 4, I loved it more than season 3 even because it was just so funny, it had Pangs, Hush, Something Blue, and I loved when they combined their powers so Buffy could beat Adam, plus the Faith episodes and Restless, which had so many clues to future seasons