I like seasons 2-14. 1 has its charms, but felt like a slightly different show. It didn't have its (ass) groove yet.
Season 15 is where it lost me. I did not like it, nor many that followed. I remember occasionally watching the odd episode after that, but it was bad for the following 10-15+ years from that point on. It got kinda watchable again recently, but it really should've stopped at season 14, had a movie (not the one we got - I hated it - but something like that 'was possibly gonna be the finale' Christmas episode), and let nostalgia win. It doesn't really have a place anymore. IMO, other than stupid episodes with bad writing, the worst thing that happened to it was trying to remain contemporary. It should've stayed planted in the 90s.