They had better chemistry with Usagi in the 90's anime than Mamoru even though most of that chemistry was just a rehash of Classic's UsaMamo dynamic but there's no denying they are a bit of a creep. No means no buddy, she's not "playing hard to get." Also their whole "Am I not good enough" scene reeked of emotionally manipulative "nice-guy" behavior. It wasn't about you in that moment Seiya, and you shouldn't have made it about you.
Fortunately, they're actually quite the gentle(wo)man in the manga at least, but then that comes at the cost of barely even having a personality besides quietly dutiful and yearning. Still, I would've easily taken the more bland Manga Seiya if it meant we got the focus back on our main Senshi and the overall lore/worldbulding of the season. Manga Stars set the stage for a Galactic wide battle of the very existence of the universe at stake and raised intriguing philosophical questions such as what it means to be a Senshi. ...Whereas Anime Stars we got mostly a romcom love triangle nobody needed or wanted cause everyone knew by now that Mamoru was end-game and no way was Naoko changing that.
Still to be fair, it's not like Seiya is the only creep in the anime, both Prince Demande and the Amazon Trio are all far worse and give Seiya a run for their money in the creepitude department.