Oh, I love my Vita as well, and in my case, lack of Vita games isn't really a problem (though the memory card prices affect me heavily, especially being a PS+ member as I am). I missed the PSP, so I have a wealth of PSP games to wade through (though, ironically, the games I've played the most are ports of previous games I've played, specifically Disgaea 2 and Phantom Brave, and on the Vita, Persona 4 and Disgaea 3. Although Phantom Brave PSP was kind of clunky, overall they are all fantastic ports/games, especially Persona 4 and Disgaea 2), and what I've played so far I've enjoyed. Only game I really regret buying was Cladun 2, if only because of its lack of support for worldwide downloads.
Other than ports, I've played Dissidia Duodecim, which I've enjoyed immensely, Gravity Rush, which was pretty fun, Assassin's Creed, and probably others, too. There are still more games on both the PSP and Vita that I want to play, like Persona 2, Dragon's Crown, Phantasy Star, and so on. So I would recommend the Vita to others, but I can see how a prospecting owner would note its library for being limited.