Watched it since the beginning, am still in love with it. I think the show has amazingly sustained quality, although it's hard to beat the raw freshness of season one. It feels very much like season 2 and 3 are more honing in on crafting it all, and it's still brilliant but again: there's something about that first season. (maybe it's Greg...?)
Still, the songs are hilarious, the storyline evocative and touching and I'm eager to see how it wraps up. The end of season three is just absolute whallop. Have no idea how the final season will go about it.