I think Johnson was actually funny with those cries. It is hard, really it is, but it is finishable without cheats as well. It didn't age well, but the game isn't that bad. On really modern machines(past 2008) (or perhaos its OS problem) there are unlit masked textures and shiny weapons don't work, which kinda get in my way.
Okay the first episode is really unfair in its difficulty at some levels, even I still have problems with the last level of episode 1 to finish it, but it is not bad, to me at least. Try it in coop, I am running coop server btw...(although not sure if it's viewable by others, not sure if I forwarded ports right, I run two other servers, one blue shift coop and other one, Unreal coop with my mods), no annoying sidekicks there for you.
There was also daikatana deathmatch standalone release in 2007 which was sanctinioned even by Romero and it is completelly free. The deathmatch is a blast.