Recently, being bored to death, I've done a google search for each of my MP maps. I found it pretty interesting to see how many people have actually uploaded them to some archive sites I've never heard of, added em' to their servers, made forum posts about them, etc.
Here's what I got:
awp_farmstead
Servers added to: 4
Decently played in: one server
Archive sites uploaded to: none
de_simc
Servers added to: 5
Decently played in: none/one(?)
Archive sites uploaded to: none
cs_tube_assault
Servers added to: 2
Decently played in: none
Archive sites uploaded to: one
So if you're interested - google for your MP maps (mod doesn't matter), post the results and maybe we'll find out, whose creations (remakes don't count. seriously.) are the most popular amongst game servers/players, etc?