I feel the same, I remember I disliked G4 when it first came out but then loved it a few years later... However, after rewatching the show a couple of years ago, I was sad and surprised to find I only enjoyed very little about the show! I get the feeling it was always a thing I liked just to have something to like, and to fit in with a fandom... I still like a few things about G4 though such as Rarity and Apple Bloom.
Then again, the same thing happened with G5 for me, I loved it with every fiber of my being and was seen as one of G5's biggest supporters but then it disappointed me more than any other fictional thing ever has haha. And people said the newest batch of episodes is excellent but I tried skimming it and Zipp and Hitch irritate me too greatly plus the animation, expressions, dialogue etc "annoy" me somehow... Is this how parents feel when they watch little kids' shows like Peppa Pig?? Am I becoming a boring type of adult??? Yet I still like lots of other little kids' shows, and love A New Generation and the Maretime Bay video game.
Anyway today's hot take is that Twinkle Wish Adventure is one of the best MLP media and the G3.5 Core Seven is the best main cast MLP has ever had--in my opinion at least!