Yeaaah IMO the Minami Ke S2/S3 hate thing is just one of random fanbase bandwagons everyone has jumped on because supposedly everyone has some random issue with those two seasons. I watched Minami Ke in full a few years ago now, but I can't remember S2 and S3 being any less funny than S1. The animation quality dropped sure but meh its a slice of life show, it can get away with it.
For me, the recent OVA was worse than S2/S3 which makes me a worry a bit about the 4th season. (Same studio).
But as I said, it's been a few years.