I have my lip pierced, with a little tiny diamond-like rhinestone. I've had lots of guys comment on it positively. I mean, most people won't come up to me just to tell me they DON'T like it, but I've heard enough favorable opinions to know that it doesn't completely f*ck up my face. Not all guys are going to like all things, but most guys aren't going to care about something as insignificant as a piercing.
It's not a look that I'd be particularly attracted to, but there are many guys who would like it. The same could be said for basically anything. For any type of look you have, someone will like it, and someone won't. Different strokes for different folks.
I used to have a snake bite piercing on my lower lip, with two small spikes when I was a teenager/early tweens. (I'm from the 90's lol, EVERYONE had lip or nose piercings then). In my experience it is either absolute love, or absolute hate from guys. Tattoos are the same way. It is either a fetish or a reason to not date you. So just do what makes you feel pretty.