1st visit to Great Wall - a friend who owned a restaurant in Shenzhen took me there - he's fluent in the language; i'm not. He did the ordering, all I remember is the clams w/black bean sauce was great.
Next 10 visits to Great Wall - all for dim sum. Agreed need to get there before 11:30 on Saturdays and 10AM on Sundays. But don't go too late; food isn't as good as the morning. Always need my "stretchy" pants (really don't own stretchy pants). I always have to eat with a rice bowl; that's how I grew up in our family. All the dumplings are fantastic, chicken feet is good, BBQ pork buns are great, egg custard, chinese vegetable all great, eggplant with shrimp (be sure it's hot) same with green pepper with shrimp. Wow, need to go back soon!!!