I wouldn't go as far as awful- but having a mix of high-def and low-def textures looks really out of place.
It would look a lot neater if they adapted vanilla textures to match, or an optional 16x texture for UE machines.
(easily fixed with a texture pack mind)
There isn't too much between a 16x and a 32x times- for me that difference is bearable. Irritating but not the end of the world.
If it added some super high definition models with everything at fancy angles however- I wouldn't touch it either.