WTF??? Is this PC.....what the hell is going on, id???????? What is this? A
console port of original PC game.....what a shame!!!

Considering that the primary bullet point for this release was "Optimized for Consoles", I think you are correct.
The textures are pre-set to "high quality" from the original release.
Interesting. I was under the impression that BFG used newer textures than that of the original game. I suppose this confirms that it doesn't. They certainly look a bit cleaner (at least to me), but that is likely a by-product of the better lighting in the game.
After reading your post, my knee-jerk reaction was to question why the "Ultra" level textures from the original release weren't used instead. I suppose that answer goes along with the whole "Optimized for Consoles" theme too, as those textures required an upwards of 500MB of graphics memory to render without issue. Despite even the lowest end contemporary graphics cards possessing that much on-board memory, the Xbox 360 and PS3 certainly don't have that.
Given that the game renders natively in 720p and other concessions made, Doom 3: BFG Edition certainly seems like a
one size fits all type of release. That doesn't necessarily make it a bad game though.