I'm not surprised, but still a little bit baffled by the reaction this kind of news often gets. Mind you, I have no nostalgia or attachment to Doom whatsoever, I'm just too young for it. So I kind of understand people who miss a game in a style they haven't had a chance to play in a long time.
On the other hand, I like there being more new games, not just more of the same. It's a bit like the people who responded to BioWare's cancellation of that co-op modern day thingie with "yeah, they better get back to making Mass Effect 4!" Yeah, let's have less new games and more old ones! Admittedly the situation here is quite different, it just reminded me of that.
An interesting thing is the idea to start a game as one thing and then reveal that it's actually something completely different. Like you guys've been saying: start it off as a CoD-like and then BAM, it's actually DOOM. I'm not sure that's at all possible with games these days due to how news, reviews, streaming, marketing and budgeting works, though. Would be rad, that's for sure!