I mean, she probably is the most beautiful senshi to me. But I think she didn't have much characterization for being bound with Uranus.

The other senshi all have their own debut and usually a short story arc to have their character development or play a big part in the storyline when they show up. But she was bound with Uranus and obviously all the attention had went to her buddy. Their romance was also too tight, we don't see them have strong struggle or facing opposition against their romance. Like Mamoru and Sailor Moon had in the first arc.

She was set to be "the near perfect beautiful girl which everyone wants to be their girlfriend", but such character type usually needs very strong character specific opposition and challenge to push for her characterization, which she lacks of.

So it caused the lack of depth of her character. If she and Uranus wasn't already a "couple" in the beginning but let us see how they meet, have struggle and grow relationship, or let her having strong love-hate relationship with a charming villain like the Nephrite-Naru relationship, it would have been much better.

She actually has quite a few interesting moments in the Stars arc in the anime. I suggest rewatching that season . But I agree it is hard sometimes to put enough attention on a character that is always in a relationship with someone. Bear in mind though that the relationship and the other person in it itself is part of what defines her... At least in my experience, that's how it plays out.