I don't like it but more than anything I don't like how the show pretends it's calling out this behavior while constantly showing high schoolers in romantic situations with older partners as normal and justified. Characters only seem to comment on teenage girls hanging out with older men when something goes wrong (in season two when Joyce finds out Buffy and Angel had sex and tells Buffy that he's too old for her, Cordy and Buffy at the frat party in "Reptile Boy") or when it's supposed to be a joke (Faith and Xander both say "jailbait" in response to the Wesley/Cordy situation at different times). It doesn't usually happen in a way that's being clearly called out.
The writers keep drawing attention to Wesley and Cordy's age gap but ultimately decide it's fine and doesn't matter and it's supposed to be funny that he thinks it's such a big deal. It's a joke more than anything. People only ever comment on Angel being older than Buffy when something bad happens, as if it suddenly matters then but didn't matter before. I don't remember anyone in-universe ever commenting on the substitute teacher/mantis because of her seducing and assaulting students, just the actual murder. I don't see the point in bringing it up in Wesley's situation if it doesn't matter when other people do the same or worse without the same kind of emphasis.
As for my actual opinions on the two of them together, I would say Wesley is a creep, but since she's over 18, and because it's basically limited to some flirting, a slowdance, and a brief makeout session, he's way less of a creep than he would be if it went further than that or if it happened earlier. I don't think he's a predator, but I do think he's a loser. And he's a loser that the show holds to a higher standard than other characters, so I don't feel like I have a reason to even care.