I'm pretty apprehensive about the new Doom. I really don't like what I see in the trailers. I'm glad they're trying to get back to the feel of the originals, because Doom 3 was very, very different. But this still looks pretty far off the mark, to me. It's all about the violence and gore. Doom has always had violence and gore, but the action, level design, and atmosphere were always more important. I'm trying to keep an open mind though. There's usually so much more to a game than what you see in the trailers.
Regarding Doom 3, I hated it the first few times I played it. It was way too dark and was focused on graphics and scripted pop-out scares more than anything else. The gameplay was nothing like the original games. But once the BFG edition came out, I gave it a shot and ended up loving it for what it was. I played through Doom 3 and all the expansions and loved a lot of it. Having the flashlight available with your weapon made the game so much more enjoyable. And once you get five or six levels in, it begins to feel a bit more like Doom should, with monster closet traps, a good of versatile weapons, and more than two enemies attacking at once. It's still not the updated Doom it should have been, but it was much better than my first few impressions.