Few years ago, Eiii introduced me to DP, liked it, and played for a bit. After a week, I got bored (which is an accomplishment).
A year or two later, I was kind of bored and talking to a few people on my site, and I remembered DP. We got onto pubs and played togther, but I was able to get up a game server on an extra server we had. A lot of my members played and we had a few 8v8 matches (they were great) for a few weeks. They liked it because, as I saw it, the game was free, not demanding, not "dark" styled, relatively small, and easy to get the hang of.
A year later, we tried it again. I didn't host it though because it wouldn't run. DP lasted about a week or two for everyone. It kind of lost its charm and we had already played about every reasonably playable map released for DP, short of the huge maps that you had to wait 10+ minutes to download. Later, I did get a server up.
Since last year, interest has really waned on and off a lot. Only 1-3 people still play, and still very occasionally. On my forum, stats are updated occasionally that track when my site's members play on my server or on the popular pubs, but that still doesn't get people to join too often.
For me personally, the only thing keeping me on DP now still is the site and that I still do run a server. I do load it up from time to time, because it's old and works well. I can't run other games either because (1) they use PunkBuster and that won't run on this computer (and tech support did not help) or (2) too new for this computer.
/end random personal story