From the videos it looks really nice, I'll give it a shot once I can find my Quake 4.

Are there any other good mods/levels for Quake 4?

i looked up what i wrote about q4 in the past. safe to say the creative scene did only doom3 stuff.

can only find this sidescroller, it exists for d3 and q4
http://www.moddb.com/mods/quake-4-hardqore

not much there
http://quake4.filefront.com/files/Quake_4/Mods/Singleplayer;3898

is it better than militia?

never played it :) didnt start