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The doom 3 source code release is great and the engine is still neat - BUT, I think I would not use it for something I'd go commercial with, simply because of the GPLs restrictions (obligation to make the products source code available). For free stuff though I think it's (about) perfect . . . but then again: for free stuff you also don't have to pay a single dime to Epic/CryTek/Unity Technologies . . . so they probably aren't any worse in that regard.
Overall I think the choice of engine is -as often- depending on application, your (team's) experience and personal preference, therefore a concluding: meh.
Thanks for the kind words - but Crankshaft Games created this mod . . we merely maintain it ;-)
And add new stuff every now and then.
+Tutorials: explaining the very basics of the gameplay
+ADA: a new suit-voice (with some extra lines)
+(map) es_vertigo_a: NGM attacking an UTF-Tower located on an asteroid, bringing you some nice space-fight.
+(map) es_derelict: try to capture the neutral derelict capship to it's weapons systems agains your enemies.
+(ship) Pre-War UTF Fighter: a little gimmick in derelict ;-)
+(ship) Scout: Placed in es_ice, these neat little ships are capable of repairing the hull of friendly ships.
+Spectating: It is a mod with cinematic battles - so why not grab a popcorn bag and watch other people do the gaming?
+Clip-style reload: with a new ammo-display.
+Auto-join: automatically selects a team on server join - speeding things up a little.
+Auto-Spawn: to make life even easier.
+Quick Class Selection: select your class similar to radio commands (has to b assigned in the Controls-Menu)
Depends on when you look . . . from about 19:00 GMT on you can find a server with half a dozen players.
"Gimli" by Thomas Vömel aka Vönix (Homepage: Voenix.de )
Just to credit the artist ;-).
. . . and drop the Link to his site, since there are some other great drawings and even books by him.