The videos on GT are indeed awful. Clunky character movements, cloned enemies, dull backgrounds and terrible AI are but a few of the problems evident.
The 7.3 rating on the video as Naznatips pointed out, shows that the majority of the GT community agree.
There are a few good things worth mentioning however, the lighting, muzzle flares, the strange weapons and armor all look great, and the music isn't too bad either.