You are pretty much settling for 3 stars when you go for dim sum downtown in Toronto. The best options are Lai Wah Heen and Dynasty which is a great location but both serve slightly better than average dim sum for very little value.
If I don't feel like driving North to a much better and great value dim sum then I default to Dynasty. All the other places just have "dim sum" on the menu but aren't any good or just plain bad.
If you really want good dim sum, you have to go North. Ask a friend or make friends with someone who knows Richmond or Markham.