Graphics - they are enhanced HOW? You just strapped a 4MB shader mod on them and called it a day? Nice enhancement. The only problem is, anyone can have graphics WAY better with usual version of DOOM 3 by using some of free fanmade mods. I mean, what the hell? The textures weren't exactly amazing even back then, they are the first thing you should be enhancing! But no, you didn't even think of it. Or how about giving few monsters more polys, ever thought of that? Apparently not, judging by the trailers.
Gameplay - the freaking flashlight. You strapped "Duct Tape Mod", which is, by the way, the worst mod ever, because lots of morons complained about what was an actual design choice (and no, Tim, you won't deceive me with all that "limitation" bullcrap, if a fan could do it and Nerve could do it in Xbox version of ROE, Ion Storm could do it on UE2 in Deus Ex: Invisible War one year before DOOM 3, you could do it too). You claim it's a "Armor-mounted flashlight", but I haven't seen any flashlight on the Marine's armor in the trailer. Also you made the levels brighter. Oh, and you also made more ammo. Because, you know, I only had a truckload of ammo on me on Hard mode. And even if I did run out of ammo with the shotgun, I switched to the machine gun and by the time I ran out of ammo on that, I'd have a lot of shotgun shells again. Listen up, the game was already really worth playing only on Hard mode (and I'm not a hardcoe guy and I'm not into the Dark Souls stuff, I usually play on Normal) because of the tension, now you're striving to ruin that.
The HUD. From the PAX footage I've seen, you didn't even bother to redraw it and now it's stretched like no tomorrow in widescreen. Instead, you just removed the crosshair, slapped stupid and ugly laser instead and thought no one would notice. Well, my dears, you were wrong.
No CoOp. What? Why? If a fanmade mod could do it, why can't you? It's not rocket science. And one guy from id whose name is John actually runs a rocket science corp!
DOOM and DOOM II: No Final DOOM, no Master Levels. The definitive DOOM collection my ass. Oh, and apparently PC gamers are getting the old DOS versions again, judging by the lack of multiplayer on PC, which means no No Rest For The Living episode. To quote one angry guy:
I won't touch it with a ten-foot pole unless there will be upgrade option for the owners of the original, because, frankly, this stuff isn't worth full price. Even for a newcomer it deserves a tenner at best and even then, only after everything interesting was already bought.