A 4 at the very least. Has to be on par with the best the city has to offer, wherever that is. I have sampled a lot in Toronto as I was seeking the same experience I had in Tokyo. Still haven't found it though.
The Toroniku which seems to be their bread and butter definitely delivered. Excellent slices of pork but I found that it did not merit a 50% markup to their regular ramen offerings, which essentially is the same bowl with a different cut of pork. It still had the exact same flavor.
Reviews mention menu a bit over priced which I agree with to some extent. Here's how the prices are:
Toroniku ramen - 15+ (really 16)
Other ramen which isnt Toroniku - 10+ (really 11)
Other ramen with side combo - 15+
Sides - 5ish
The broth did get quite salty halfway but other than that, not much to complain about really. Definitely worth a try. By the way, just like any other decent ramen place, dining area is small and there's always a line (and i'm talking 3pm on a sunday)