I love the way people throw around the term 'generic' as if that's substantial. Hardly any shows are original anymore and when they are, people are unsure whether it will be a hit or miss since they're trying something new.
If you enjoy the show, then there's nothing wrong with it. Just because a show's generic, doesn't mean it's bad. Buso Renkin is perfectly generic in every way, but it's aware of it and pokes fun at it; it was executed well.
Soul eater does have a very un-original storyline and it's easy to see where the ideas were taken from, but the anime is very beautifully animated and orchestrated. You'd have to be a fool not to see that.
And the whole 'LOLOLOL SHONEN IS FOR KIDS, WATCH SOME MATURE SEINEN ANIME' is a very old and very retarded argument. 70% of the anime coming out of Japan is shonen or Kodomo, since animation appeals more to a younger audience. (It's just a fact) If /a/ was really full of shonen dissing, moeblob hating, harem-fanservice trashing anime lovers then where are all the threads about anime without these characteristics?
tl;dr Grow the fuck up