I enjoyed it enough to download Day of Defeat 1.3 again :D
I was the original mapper for the Day of Defeat team. It was quite a ride to go from a bunch of strangers making a mod for fun to working with Valve.
I haven't played it in ages, but do sometimes think about going back into map making just for fun and maybe more as artistic expression. Always that temptation to make something neat looking, but not very performant.
DoD started as a community project, most of the famous maps are from amateur contributors (anzio, caen, harrington, chemille, etc).
It's not without its warts and faults, but after not having played any serious WW2 shooters since Day of Defeat, I now have around 400 hours into this game, and am still having a ton of fun.