As long as it's not overdone. If every review ends in "you can do better" it just becomes the new "must apply themselves more in class".

So long as you're not having to "you can do better" for the same issue every time, I think it's fine. There's a lot of minutia to learn in software development; a lot of opportunity to screw up.

I don't want to ever work at a job where to can't get better.