I just posted my thoughts today after playing through Resistance Retribution, a PSP title, on the PS Vita. My thoughts are the following:
"Retribution brought the Resistance franchise to the handheld market in a pretty robust Third Person Shooter. On the downside, the presentation took a hit on the Vita, and some features of the original game are not accessible without playing on a PSP. Looking past that, though, you’ll find a lengthy shooter full of science fiction action for the casual and hardcore shooting fan."