Especially the initial attack on Luke on his Tauntaun, the Wampa's face just looks like a big static Muppet of the abomnible(?) snowman from one of those cheesy 'Frosty the Snowman' Christmas stop motion animation specials , being thrust at the camera, and the colour and lighting don't even come close to matching the footage of Luke that was shot on location, let alone the sense of scale, and then the big static arm on a stick swats him from his Tauntaun and breaks the creatures neck without any sign of articulation.
then theres that horrible shot inside the cave as the Monster is running towards luke which just screams 'Im an average sized guy in a shoddy looking suit running towards camera with my hands obscuring my face so you can't see how shoddy the suit is.'
as for the 'Wampa was scarier when we couldn't see him' argument, as valid as it may be, the truth is we've known for nearly 30 years what the creature looks like, he only has a brief shining moment in the whole saga. Rather than cutting the new footage of a far more convincing looking Beastie why not try and make the original footage look as badass and scary as the film-makers intended and attempted to in the original production?
It may sound ambitious , and i'm not sure how talented Ady's 3d animators are when it comes to character animation, but judging by what they were able to pull off with the new space-battles and ships, it shouldn't be too hard for them to breathe a little more life into the few quick frames in which the creature is shown. I wouldn't normally bring something like this up, but the original Wampa shots have stood out as some of the dodgiest looking effects in the series since I originally saw Empire as a 10 year old in 1980.