Overcrowded, lack of crush space, byzantine circulation patterns (particularly the pass-under) - and I can't imagine how it can interface with the DRL properly without some serious reworking of the station.
Unfortunately, I think the Yonge-Queen station will be somewhat like a T-arrangement. I can't find the display board online anymore - thanks to the utterly useless Reliefline.ca website:
http://reliefline.ca/the-project/meeting-materials-
Like REALLY??? How much space did that material take up, so much so you need someone to answer an email to have it sent to you? How incredibly retrograde (not like that website is the paragon of good design in the first place)
AoD