As some people often comment on users who routinely undertag their images, here's a look at the top and bottom upload taggers of the top uploader lists.
top 10 general tag users per upload:
1. zeparoh 47.420
2. Qpax 43.308
3. KazuyaRazuKazama 39.077
4. Provence 38.490
5. Nitrogen09 34.569
6. BlindSargent 33.080
7. Shallie 31.966
8. Sacriven 31.633
9. Lannihan 30.882
10. dereyoruk 30.403
bottom 10 general tag users per upload:
1. cutemi2 7.387
2. beltman 13.459
3. Christianlush 14.607
4. akp47 14.736
5. Blue_Stuff 15.214
6. nanami 15.319
7. magenta-crimson 15.365
8. RazingK 16.468
9. kars41 17.093
10. DeusExCalamus 17.735
top 10 (total tags less tag errors and removes) per upload:
1. zeparoh 50.917
2. Qpax 46.455
3. KazuyaRazuKazama 42.481
4. Provence 41.452
5. Nitrogen09 37.747
6. BlindSargent 36.912
7. Sacriven 34.875
8. Shallie 34.801
9. Lannihan 34.355
10. Jarlath 34.186
bottom 10 (total tags less tag errors and removes) per upload:
1. cutemi2 9.774
2. beltman 17.786
3. akp47 18.292
4. Cristianlush 18.567
5. magenta-crimson 18.669
6. nanami 18.844
7. Blue_Stuff 19.384
8. DeusExCalamus 20.915
9. RazingK 20.921
10. kars41 21.740
Obviously, different images will justify a different number of tags - for some images less than 10 tags may be fully tagged, whereas for others the tally will be in the hundreds. But for someone uploading 100+ images it should more-or-less balance out unless a user uploads only images that have lots or few tags applicable to them.
The best tagger on the list out of those without unlimited uploads is GiantCaveMushroom, in 13th out of 40 for both rankings.
It's also perhaps worth mentioning that 2 of the users on the bottom 10 rankings are currently banned.
The average figure is 25.081 for the first list and 28.515 for the second. The average tags per image for both lists are slightly higher as those who upload more also tend to add more tags (5 of the top 10 tags/image have >500 uploads, whereas none of the bottom 10 does, although the next person off the list has well over)
It might be interesting to have a top (and bottom) tags/upload list for everyone - if possible with errors and removes subtracted from the list. For obvious reasons there would need to be a threshold for the number of uploads to stop both lists being flooded with people with 1 or 2 uploads. 100 is more than enough for this. 50 would probably be fine, too.
While we're at it:
Lowest proportion of tags removed or errors: (remember, this is a good thing)
1. GiantCaveMushroom 0.119%
2. tapnek 0.155%
3. zeparoh 0.160%
4. Nitrogen09 0.169%
5. BlindSargent 0.205%
If people want me to then I'll remove the negative stuff, but this is all calculable from the information in the OP anyway...