I can only speak for myself, but this is kinda what I'm thinking too. This is the first season that I've actually felt disappointed with. There have been some episodes that I've loved this season, but there have also been many that I just haven't liked, and they seem to be correlated with all the new writers who have just joined this season. Many of the episodes this season feel like they're missing that charm that the show usually has, for me anyway.
For example, I feel like I lost some respect for the Wonderbolts in Newbie Dash because they've never been just blatantly insensitive like that before. They knew Dash didn't like her nickname, but they kept using it anyway. Also in today's episode (28 Pranks), Dash was being just plain mean to Fluttershy in a way that she hasn't since S1. Even after the other ponies sat her down and said, "seriously stop; you're hurting other ponies," Dash basically said, "I don't care; I enjoy it." I realize that in life we often end up having to learn the same lessons over and over in different ways, but Dash's change today felt like such a jarring step backwards for her that it didn't fit her continuity for me.
Maybe this season will grow on my eventually, idk. Hopefully I'm over-analyzing. I'm glad lots of people are still enjoying it though!