New ships can certainly be powerful or weak, and for extended periods of time.
As for now, she's only been out for a month or so. Barring extreme outliers, we typically collect data for 2-3 patches before we start looking at if changes are needed, so there's still more time for people to try her out and see who can make her do what.
I like her a lot, and I know many others that do too, but there are also CV players that feel she is simply unplayable because they want to hunt Cruisers and Battleships in other ways. Everyone will have their own taste/playstyle.