I just looked on Game Rankings. The Vita has had 13 releases since it's launch scoring 8/10 or greater inc claiming 2012's highest rated game in Persona 4. Interestingly, the 3DS has managed 3 releases to average 8/10 this year. (Has 11 in total in 2011 releases).
Makes the no gaemz argument pretty redundant. The systems software libraries are actually fairly even in quality overall.