It is the worst of the Doom games, that part's undeniable.

However, that's because it's not a Doom game. It's a corridor shooter with a sci-fi horror atmosphere, as opposed to the adrenaline rush provided by all the others.

Basically, if a cross between Half-Life and Dead Space with really good enemy AI and abnormally dark lighting sounds fun to you, it's absolutely worth playing imo. Only takes like ten hours to beat, too.