Speaking in the latest issue of MCV , Pete Hines explained that he was "surprised a little bit by just how much folks liked and got the single-player.

Bethesda's VP of PR and marketing has said that he was "surprised" by how much people took to DOOM's single-player campaign, revealing that he was concerned the game could attract some middling review scores for its more traditional, old-school approach.

"If you are at Bethesda and play the single-player, you might think it's really fun and different. But you don't know if you're drinking your own kool-aid... is it really fun? Or are people going to play it and dislike the fact there's no voiced protagonist, or the fact there's no real story, and will they say: 'id Software hasn't got out of the 1990s. Same old, same old. 6/10'. You never know which of those two scenarios you'll end up getting."

Bethesda launched a time-limited single-player demo of the game back in June, one month after the game's release. Prior to launch it had only released beta versions of the game's multiplayer mode to the public.

"We did the single-player demo after launch," Hines continued. "We had showed off the multiplayer, but we hadn't managed to show as much of the single-player. So giving folks the chance to try it... well it turned out to be a good idea."

I personally thought DOOM had one of the best single-player shooter campaigns in a while. Miller agreed.

A free update for DOOM's campaign mode introducing a brand new Arcade mode is set to release later this year.