I wouldn't call Bloom Into You overrated. My issue with it is more that while it's very well executed, it still only tells a very typical story I read many times before, so despite it nuance, I lost my interest in reading it. I really wish it would go a different route and explore some new grounds, while still being as well written as it's now. And yes, I'm fully aware it all boils down to me setting some expectations and story not meeting them. I'm sure I'll enjoy it when I feel like reading that kind of generic plot again.
It's really not generic. While Bloom isn't doing anything ground-breaking, the quality of the writing outclasses anything remotely similar. There is very few manga as emotionally complex as YagaKimi. I've read a few stories where the main protagonist starts off not knowing what love is like but, YagaKimi's the only one that has done this concept justice IMO. There are quite a few stories that have a seemingly perfect girl with a hidden side but, apart from Monogatari, I can't think of any that have done it properly. It explores new grounds by virtue of going deeper into the psyches of it's characters.
YagaKimi isn't special in concept but, it has become special through impeccable execution. You're basically comparing a burger from a fast food restaurant to a burger from a 3 Michelin Star restaurant.