I helped my sister find DC downloadable games. And unfortunately, 95% of all the games available were 1-on-1 fighting games. The few others were simulators (Crazy Taxi, flying games).
The only RPG I can think of was Phantasy Star Online. It was down for at least a decade when we downloaded games.
I look at PlayStation, and it was RPGs galore. And while there was shovelware, there were all sorts of games from every genre.
If you're interested in picking up some DC RPGs today for nostalgia I would recommend Skies of Arcadia and Grandia 2, the latter did some to PS2 though.
