Once upon a time when I thought this building was going to be high quality, I thought the sets of walls facing inwards towards eachother were going to be curtain wall. Ohh how wrong was I, instead we get messy window wall and grey? Spandrel for some unbeknownst reason.
As for the hate for this building. Yes it might be better than a lot of its immediate surroundings but that's a very very low bar. There's also plenty of buildings nearby that are better and many new buildings going up that will be way better.
The other part is expectations, this was promised to be a showstopper, so getting such a low quality final product understandably has generated disappointment and dislike. The original ideas (which remain good) are masking - to some extent - just how bad this is, but most on UT know this and are not fooled. Hence why it can look ok from a distance (which it does mostly) and still be a disaster.