My nails grow like crazy and I constantly have to trim them so I can still function. I have not yet mastered how to do certain things with really long nails like everyone else..I must admit I am a bit envious. I like all sorts of nails on people..painted, french manicure, natural. I also like various lengths and think it just depends on the person. I keep mine natural most of the time on my hands, but my toes are always painted if there is a chance someone would see them. I wear clear more than anything, but that is just to protect my nails. Toes are because I cannot stand my toe nails, though. I have seen natural toes on others and it looks great!
What I do not like is dirty, extremely chipped nail polish or nubs(biting so extreme that this is all you have left). Granted, I know it's just like any other bad habit to bite nails for some people, so it doesn't bother me if anyone else does this too much. I did teach my daughters from a very young age to refrain from biting their nails, though. I guess I don't mind any particular fashion or length but I do prefer it not to look overly messy or dirty. It drives me nuts when my girls walk around with black nail polish that is chipped off more than 50% and I usually request that they change it once a week. I do have to pick my battles with teenage girls, so I let it go sometimes. I have explained to them that it looks dirty, tacky and unprofessional (in my opinion) to walk around like that and the importance of them understanding this so they avoid it in future professional and social situations where it would not be acceptable. I do require them to always keep their nails (and under them) clean, but that is just a hygiene issue.