Most Helpful Girl
If the alternative is talking too little, I'd prefer them to talk in excess.
It's also highly dependent on context. If they're going on a spiel about their achievements and not letting me get a word in, that's a turn-off. But, if they've lost themselves in explaining something they're passionate about, I don't mind that at all. Or, if they're nervous and that makes them ramble a bit and use more words than necessary, that's fine. I can sympathize with that.