I recently spent quite a sum of money taking my mother out for her birthday dinner here -- we ordered abalone (which cost $40 each), some kind of cod fish steamed, some kind of "chef's special" shark fin type soup, and stir fried vegetables ("dow mew in Cantonese") with a crab meat glaze over it.
Overall, the best dish was the steamed fish because you really can't screw it up unless the fish is not fresh.
The expensive abalone was way too salty, and so was the stir fried vegetables -- we complained to the manager, and he pointed it back to it being our fault, saying maybe next time, he'll ask the kitchen to put in less salt. The point was it was too salty that it was barely edible -- what poor service, and also he didn't take the customer feedback seriously.
As for the shark-fin soup type creation -- it had the cartilage part of the shark fin in it (not the actual long strands of fin), and they mixed some crab paste (from the shell head) and some tobiko like eggs... but it did not taste like shark fin soup. This one is probably more of a matter of preference -- it was not too salty.
All in all, I would have to say that the quality of the cooking has gone downhill.
As for dim sum, they have really large shrimp "har gow", but it is way too big and also the outside layer falls apart really easily. This is not good "har gow". It's kind of nasty, in fact. If you want good "har gow", go to Top Gun in Crystall Mall -- that is good "har gow".
The steamed pork buns are good, everything else I would say is really below par for Vancouver dim sum. However, I'm sure that in Toronto, Fortune House Seafood Restaurant would do well, as in general I have found Toronto dim sum to not be as of consistent quality as in Vancouver.
I would stay away from Fortune House Seafood Restaurant for dim sum and for dinner.... unless you enjoy overly salted foods.