I've been living in Toronto for about 3.5 years now and just this last Friday I made my first visit to a Mandarin restaurant. This place is straight-up dirty feed at it's best. No person ever needs to eat at a buffet but sometimes you just have to dive head-first into gluttony.
I wouldn't say Mandarin is different than any other Chinese buffet you've been to in the past other than that they might have a slightly larger selection and the presentation is a little nicer in some cases. Now, everyone likes good service at a restaurant, but these guys go a little too far. When the server is refilling your water glass practically after each sip, you know it's time to back-off. It's pretty annoying to have someone constantly reaching across the table to top up your glass. Besides, I'm not here to fill up on water, I'm here to stuff my face full of dumplings!
Mandarin is fine, but don't expect anything amazing.