non-greasy, thin-skin dumplings(more innards, less glutinous cover), fresh ingredients(that's a given).
That said, my favorite dim sum places in Manhattan Chinatown are Oriental Garden and Dim Sum Go Go. The only places I have not tried that ppl seem to talk about are 888(?) and Golden Bridge. Golden Unicorn and Jing Fong are my least favorites. HSF and Nice are not bad. Am I missing out on another hidden gem in terms of Dim Sum?