Why do people want an iconic structure here? For one, this building already has an interesting design. Yes it's muted but that isn't inherently bad. Also, the location is terrible for an avant-garde design. This court house will be right beside Nathan Phillips Square and New City Hall. It's going to be surrounded on all sides by other buildings, with only the south face of the building really visible. Finally, the building is on a side street in a fairly ho-hum part of the city. Why would you put a wild design in a place that people won't be able to see it from, that people don't really venture and beside an already iconic, city-defining complex? To me this is the perfect place for the muted but sophisticated design the rendering suggests.
Also worst case, if the renderings prove too good to be true, all the above still applies. The court house just becomes filler and hidden from most angles.