I enjoy playing a variety of game types, especially DM and MWGG, but agree too many of the populated servers at any given time are Arsenal, LTK, or locked/private.
It takes people hopping into a 0/16 server and being patient, and then it takes 2-3 more to join that person. Then before you know it there's 10-12 in there having a great time - but it doesn't happen if no one takes 10 minutes to sit in an empty server!