I really wish retro-style FPSes like this were more common. There is no shortage of retro platformers, but it seems like not many people are making shooters that harken back to Doom or Quake.

Cover systems, realistic weapons, online ranks, etc is all fine; I just wish there were more games like this. I could play this game all day.

The author links to this essay about Doom which I think really gets to the heart of it: http://vectorpoem.com/news/?p=74