Admittedly being fond of Connor helps with season 4 appreciation although masquerade who adores him loves season 3 best and dislikes a lot of season 4, so it's not a sine qua non. I love huge parts of season 2 (which also happens to feature my very favourite Jossverse character, Darla, a lot), but there is too much unevenness for me to like it the best, and I don't just mean Pylea. Whereas season 4 moves like a relentless tragedy, and you can see from Deep Down to Home how everything clicks into each other.