Gotta disagree, but I'm glad first person shooters that are similar to Doom (I define these as arcade style first person shooters) are still being made and that there is still a market for these types of games. The game is definitely a very solid and well made game, but I personally had more fun and enjoyed games like F.E.A.R. 1, the Serious Sam games, and Shadow Warrior far more. And I know that you're only comparing true 3d first person shooters, but I still think Doom 1 and Doom 2 stomps all over this Doom.
Looking at the bigger picture here and into the future, the fact that this game is selling very well is great news, especially for fans of these types of "arcade style" first person shooters like me. It tells developers that, hey, not all first person shooters need to mimic Call of Duty and Battlefield in order to succeed and that there exists a sizeable audience for games similar to Doom. This bodes well for the future, as maybe other developers will then take a stab at these "arcade style" fps. For me, there simply aren't enough of these types of games, and I hope that more games like this are made in the future.