Fun old school shooter.
Here i would say would be the birth of FPS. Not my favorite series but still fun to play. The doom series in my opionon has always been ones of the best thought out games for shooters. The levels are challenging and they don't just give everything away.
This game was alot of fun and was even hard on the normal mode. Finally beat the game on my 64 but I think it was doom 2 so i'll go check. I would highly recommend this game if you are big into fps no matter the graphics.