I've been eating dim sum since I was a child. It was my family's classic sunday 'brunch' every weekend. With that being said, rol-san is straight middle of the road dim-sum.
I used to love the place in college because first of all it's open till 4am and when one is out that late, tastes are usually not so discriminating for obvious reasons. The price is really cheap too so I couldn't really complain. There usually is a wait but for the most part it goes by fast.
It was when we started coming here for lunch that I noticed it really wasn't the best. Honestly I don't have much to say about this place, I've tried a huge variety of dishes, none of them were spectacularly bad, but the food quality was a bit low. I usually felt pretty gross after (though I have to admit you could do a lot worse in chinatown).
Good place to go to late-night and on the cheap.
Would I return? Meh. There are a couple of better options in the city (even though everyone knows the GTA is really the best place to get dim sum)