the first doom game was revolutionary for its time but overall is boring doom 2 improved upon this and made it slightly better by making it harder and adding more monsters still the game was lacking. when doom 64 came out it showed dooms potential whatever mistakes came with doom, doom 64 improved and with new weapons, monsters and puzzles that will make you spend hours on the game, doom 64 is a fun game.
if you decide to play, enjoy.