Awhile ago i recorded a bunch of gameplay of me playing doom 2 online (PC, LOTS of mods *WADS*). I have no idea how i even got it to work lol, but hard drive space forced me to delete all the WADs i had installed while playing.
Heres a video of all the fun i had =p.
http://www.youtube.com/watch?v=ESXucIs_cnA
All you really need to buy to get any of this to work is doom 2 on steam. Everything else is free community made stuff.