[rathel]

You may have a look at http://hdyc.neis-one.org/?Stereo to try and find metrics relevant to you (example profile, to retain privacy profiles are hidden behind an OSM account login-wall, unless said user links to that page in their OSM profile site, which this example user did)

One great metric is mapping days (distinct calendar days in which the user was active) which sort of abstracts the fact that different people tend to have a different idea how much work warrants a single changeset.

[stereo]

I feel like somebody's watching me :p