BART (Bay Area Rapid Transit) is really all the public subway transportation that I'm familiar with. In comparison, TTC is pretty good. $3.00 CDN a ride - regardless of distance - makes the token vending machine much easier than the ones that frequently break @ BART. Tokens also means that once you're in, you don't have to worry about misplacing your ticket somewhere during the ride (which happens to me a lot).
No published schedule other than the hours the trains are running - and I never had to wait more than 3-5 minutes for a train - which is awesome. Of the handful of stations I passed through, they were all pretty clean, well lit and from what I gathered - felt relatively safe. I also did not encounter any crazy bums playing the PENIS game ... but then again, I was only in Toronto for 4 days.
Not bad at all and pretty easy for tourists to navigate on.