I can't speak to his defensiveness but there certainly is a lot of over-the-top criticisms of something most of us haven't viewed yet.
Am I disappointed with the screenshots of the VFX we've seen thus far? Yes. Do they "look like ass". I don't think so.
Some attribute the differences to an inferior effects house or it being done on a reduced budget, correct me if I'm wrong but AFAIK the only thing we know that's concrete is there was a different approach taken with the material for Season 2 to 'recreate the original experience'.