Unlikeable MC is subjective, he's really likeable to most people. The story overall is fairly generic, but it's world building and mystery is fairly well done. It's a generic anime but with splashes of uniqueness.

Not really, Demon Slayer has some of the best animation, but I'd say it's not all that it offers, it does have unique takes, for example it's setting, which isn't exactly prevalent in anime. The story is overall generic, but a lot of the backstory is well thought out and entertaining, I'd describe it as generic done well.