I'm no transit expert, but here's my two cents worth.
It's necessary that Metrolinx would want to relieve congestion at Union - one would think that this sort of thing would be the basics of their job. But it doesn't look like much else has been taken into consideration.
I find it interesting that so little about Toronto's transit makes intuitive or pleasing sense. It's like we're still working on a PET computer, while the rest of the world has moved on to Macs.
The two plans shown as Metrolinx's favourites seem really kind of half-baked to me. Both new station positions seem awkward. I can't imagine people are going to want to be transferring or walking to or from them, with the actual Union Station so close by. It's almost like it was designed to frustrate. Plus, I don't see them becoming major new stations that will act as nodes to tie lots of new lines together. So it all seems rather provisional.
Secondly, it's like we got two-thirds of a DRL, with a perky, commonsense east end, and a truncated spur of a west end. I think a subway to Exhibition is a wonderful idea! - longed for, and hoped for. But - it's so....partial and disappointing, compared to the prospect of the DRL continuing on to rejoin Bloor in the West. Plus, it leaves Queen west without almost any DRL at all - and what use is that? If there's any street in downtown crying out for transit relief, it's Queen. I think the DRL would go nicely under King, too - but, c'est la vie.
I have to agree with the people on here who says it looks like it was designed for commuters, but not for people who actually live downtown. It looks like a plan that was cooked up trying to get the most tolerance for the buck on a budget that would hardly buy a birdcage. A plan that only a bureaucratic planner who had no idea of how people actually like to get around Toronto - and rely on transit to do it seamlessly and pleasurably - could love.
Also, the fact that even this piecemeal bit hasn't been fastracked to have been built by yesterday is frustrating in itself.