The first season was decent because the story had considerably more focus. Plus, the jokes were actually rather amusing and generally had decent setups and punchlines. I cannot speak for the focus of the show in later seasons, but the jokes were considerably less funny from what I remember.
First season, like all seasons, was terrible, but it's just slightly better IMO.
I watched Unova up until those couple of episodes that got pulled. The show was actually doing a semi-decent job of building up to something, but as far as I know, those pulled episodes haven't been aired since. Kinda killed any desire I had to watch it, and yeah, they kinda went back to the old stuff after that.