By "urban fantasy" are you talking vampires, werewolves, necromancers, etc? Because I know plenty of people who play those types of OCs. It may just be what circles you've been playing in because in the ones I'm in it hasn't been a problem at all. There's of course going to be judging from somewhere on the internet, but if I want to play a vampire from a modern setting or a superhero, I'm going to do it whether or not some random anonymous person likes it. If you enjoy your character, the people you tag enjoy your character, and you're not trying to disrupt or godmode anyone else's fun, then what they say doesn't matter.

Now I will say that after a while, it can start looking like all the worlds are the same and too many of the same ideas are being recycled, but I think the best way to get around that is showing how your character exists as an individual in their world. Some people worry too much about things been too similar so they go a little too far in proving how "different" their world or their character is, which I think is where the Snowflake Syndrome comes from. As long as you aren't shoving how different and unique and SPECIAL your character is down people's throats, you're doing okay.

I personally think that worlds that have depth, involvement, and an air of realism (as in I could understand why the people and cultures of that world have developed the way they have), then they will always be interesting in some way.