Beautiful Doom is the grandfather of total enhancement mods. First released back in 2008 this mod aims to improve each and every single object in Doom, making them smoother, more impressive visually and having better sounds while retaining the original Doom gameplay. However, for those, who like to spice things up there are 3 weapon sets to choose from and a number of features to tweak!
Trailer for Beautiful Doom 6.0 release. Slightly outdated since some new features were added in later releases.
I'll try to update the trailer as soon as I can. For now I'm very busy with other work. Please note that some of the things are different in the current version (for example, the trailer doesn't show two player classes, and lamps can now only be destroyed by explosions, not regular guns).