i personally dont like usagi (sailor moon) in her whiny version much
but to be fair no one does
That is very much the point of Sailor Moon though
Upcoming throughout the 70's and 80's much of anime and manga's protagonists were those who were either destined for greatness or adapted quickly to the power thrust upon them. Think about stuff like Golgo 13, Hokuto no Ken, Macross and Gundam especially (with the Newtype business). Sailor Moon is much about an ordinary person growing under the circumstances she's been put into and very often cracking under the pressure of it. This trend was very much normalized by Evangelion later on so people don't necessarily realize how big a deal this actually is.
Plus Usagi becomes quite a badass when she awakens as Princess Serenity