For me, it's not necessarily the architecture but, the overall scope of the master plan that leaves something to be desired. Note: nearly every single on of those towers is a singular development with plenty of room to breathe. Urban form takes a back seat. Some are just downright gimmicky.
I don't necessarily agree Toronto's condo developers aren't daring or ambitious when it comes to design. (so so on materials) It's just the market we have. Most markets lean towards the luxury end. They also may have poor labour laws which drastically lower construction costs or are backed by the crown. I don't favour structural expressionism over a good modern design either.
We have to be real. Pigs will fly and the stars will fall long before a Manhattan supertall (MoMa) sees the light of day in Toronto. The real estate value projections for some of these towers are approaching $5 billion. You know what you could buy here with 5 billion USD?