I bought my Vita last Friday and I'm quite happy so far. Got 7 full VITA games to play, some free games as "Frobisher says" and several PSOne (Final Fantasy) titles.
It is indeed true that ports from older systems play a big role, but why shouldn't they? I never had a PSP or PS2, so I can't wait to get Persona 4. And PSOne games look great, far better than on my huge tv screen. They even sound better than on the PS3.