In deed. Take a look to Unreal Tournament and later UT's.
Making a nice map on the original UT is prety easy (and very similar to DooM but in 3d). On 2003/2004 it' keep being not too hard and you have the static meshes to make your map more nice. But, UT3 map creation become a little nightmare.
Also, moderm DooM source ports, added a lot of features to DooM. For example, you should take a look to kdizd , Real guns mod for Zandronum (This mod, makes Modern warface and call of duty a piece of shit!), and a huge list of maps and mega wads that have a insane quanty of quality work to be funny & highly detailed.
I keep playing DooM (using Zandronum) on multiplyer... The best game of all time.
I only hope that ID take a look how do a proper remake of a classic game, taking a look to Stainless work with the new Carmagedon. Really is better that Carmagedon 1 & 2