I don't really dislike any piercings, I think it's up to the individual. If you like it, get it. If you don't, don't.
I've got my tongue and navel done. I'd never actually seen back dimple piercings til I just googled it. link looks pretty hot. But I love the way back dimples look, so I'd never get it done. Plus, dermal anchors look f***ing painful. I like nose, too.
Whether they are 'trashy' depends on the person, I think.
Nose rings can be cute if it's like a little stud, but not a ring. I think rings look kinda trashy in the nose for some reason. I don't really care either way about tongue piercings. I like belly rings and I have one myself. There are so many cute dangly rings to go with and I think they're really pretty. And I've never even seen a back dimple piercing so I have no idea what I think about those haha.