The various review tasks which give rise to these badges are of vastly different incidences, difficulty and significance.
For example delete votes are frequent and easy to accumulate (as well as occasionally being controversial and sometimes open to forms of misuse). The decision is straightforward in many cases.
By contrast approving edits is a challenging task requiring significant attention to detail - and a good edit is a wonderful thing.
It struck me the other day that there is inadequate recognition of the harder tasks in relation to the easier - and we should cherish good editors (this is not a plea for myself, I'm not in the league I'm talking about).
So would it be possible to recalibrate badges in the light of experience on the site so that they represented comparable effort, rather than comparable scores?
There are other categories which might be reconsidered, though I have to say that having a gradation of difficulty does have the merit of drawing people in a bit.
What do you think?