I bet you haven't tried or seen UnrealED 1.0, 2.0 or 3.0. (UED 4.0 which comes with UT3 and GoW I guess, I didn't saw it yet) THAT was a complicated and unintuitive level editor to begin. BUT, as everything, when you learn on how to use it, you'll find it's more complete than GTKR, it has everything you can imagine, except a program like Photoshop or GIMP or a sound program.