I meant there's only one Suikoden game on the DS, compared to the dozen or so DQ/FF games on the same system :P

The 360 does have more RPGs, but then when you list the RPGs most people here wouldn't really care much about them. Maybe they'd care about them if they got PS3 versions, like Star Ocean and Tales of Vesperia (though Vesperia's not coming in English), but otherwise they'd probably convince themselves that they're not interested.
And some of them are pretty bad. I can't in good conscience recommend Operation Darkness or Zoids Assault, though I own them and they are both 'exclusive' Japanese Strategy RPGs for the 360. I *could* recommend Culdcept Saga, but that's a pretty hardcore card battling game that looks like it came from the PS2.

360 has much more of the lower budget RPGs, while the PS3 tends to focus on the pick-of-the-litter when it can.