The best thing at the Bloor Street Diner is their "french food", french onion soup and their muscles and fries. It's as good as I've had in Montreal. I've not been to Paris yet so I can't compare that.
They are normally busy, so the service can be a little slower at times. It is a very pleasant atmosphere. It isn't "fru-fru" (I guess that is the diner part) but it has a upper scale vibe.
The summer season, the patio looks on to Bloor Street, it is a nice place to have a drink in the summer.
I'm not a terrible fan of the desserts unfortunately. The bread pudding is good and so is the ice-cream sundae (it is nice to split with a friend). I hope they expand their cake menu.