Ah, well I liked that one, glad to see you're playing it. I started it twice and got relatively far both times, but...I need to beat it one of these days.
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As someone who owns a Vita, I'd say it depends on what you want.
For me, Persona 4 Golden alone was enough to warrant a purchase, and it helped that I missed out on most of the Vita era because I got to enjoy games like Duodecim Dissidia as well as the Persona ports for the first time. But it also let me experience Danganronpa and its fantastic sequel, the Disgaea ports (which are all much better than their originals).
Then there's the SAO games, Senran Kagura, Hyperdimension Neptunia, Lost Tower (or something like that), Freedom Wars, and VLR, which isn't exclusive but hey, neither are HDN, SAO, or Senran Kagura. There's also Deception and Gravity Rush. Simultaneously not that much and a lot, depending on what you're into.
And if you're not sure, get a PSTV for $40.