I'll give a response then, at least to a few comments.
The "Bad" points about the characters I somewhat disagree with, Rarity especially. Fluttershy's a tricky case, since (despite being Best Pony), she's had some pretty extreme-yet-basic personality sides from Frame 1. Her frightened, shy tendencies are really what define her, with a side helping of "bravery when really, really, really necessary (i.e. not quite Magic Duel, since they also could've sent Spike to do that job. Or a raccoon with a note tied around its neck) and slight anger issues (which didn't pop up until the Season 1 finale). I wouldn't say she's become more extreme (Jekyll and Hyde and all that), but more that she's just what she's always been. Admittedly I would prefer some growth to stick here, but dammit, it's Fluttershy. She is what she is, and we love her for it so.
Rarity is a bit more interesting, since I always argue she's the most rounded and deep character on the show. She's got her generous side (naturally), while also her "succeed in a small business", along with "get into high society", along with a massive ego (only countered by said generosity), and plenty more. I think she's just been a lot more subtle about it as of late, especially since she spends so much time in both "good" and "bad" parts of her personality. She's more than just her Element, basically. Sleepless in Ponyville is actually a great episode for her, because it showcases a lot of these personality sides (especially her relationship with Sweetie Belle, which is always a good focal point). She whines, but still goes along with her sister. She makes her do work, but then immediately takes her off the work duty when someone else offers to help (not exactly the best thing "overall" to do, but she doesn't hesitate at that point to shift the load. And at the end she relishes the idea to just have fun with her sibling. She's a complex individual, no matter which end of the moral spectrum she seems to be sitting on, and I quite like that.
As for Pinkie, I'd say we've been getting a good amount of development on her for a while (outside her massive abandonment issues). The baby episode in particular was a lot of growth for her, showing that there are times when responsibility isn't all fun and games. The clone episode does it good too, and I agree with what you say there, but my point is it's not the only time. It's just the sort of thing that gets buried a lot beneath her hyper base personality (that's something to consider for all the ponies, really. How they act normally is how they act normally, it's their actions in crunch situations that really stand out more. They don't have to have those crunch attitudes all the time, though. That's just unnecessary).
As for the fanservice people... I've seen those complaints too, and I'm not really sure what these people want. The Trixie and Scootaloo episodes where far and away the best of the season thus far, and felt very organically set up. Scootaloo's especially, since she'd A) never had her own episode and B) been acting that way towards Dash for two seasons. About time she got her due. They're good ideas that normally wouldn't be minded so much, but since this is an obsessive fandom that's already thought up "everything" in fanfic and art, any time an idea is used that we already considered, we seem to assume it's fanservice.
Other than that (well, save maybe for the fact that I love the Crystal Fair song, though really wish it was longer. Babs Seed too), I pretty much agree with what you have to say.