I'd like to start off by saying that I'm speaking only for myself and my views. Please don't take this as anything else.
The Playstation Vita is an interesting case in this still young generation of video game hardware. It was the "ultra-powered" hardcore handheld experience that was meant to blow the 3DS out of the water. Sadly it's done exactly the opposite and has seen little success in the process. Many a Sony fan are quite pleased with the platform and that's a great thing, but it simply has not caught on with the broad audience with which the 3DS made off.
There is a variety of reasons anyone can list for the poor sales and they all sound familiar when in a discussion about the Wii U which is, after its first two months, seeing a similar downturn in sales. Factors like "lack of games", "price", or other such issues. In my case, it's a little of both.
My preference generally lies with Nintendo above the other publishers, so justifying my Wii U purchase with games was easy. I had the intention to play Assassin's Creed, Black Ops, New Super Mario Bros., ZombiU and Ninja Gaiden from the getgo. That there was my five plus games to play and I always justify my hardware purchase with at least five games. Not everyone will agree with this library because some of these games are available on other platforms, which is a perfectly viable argument. With the Wii U, I purchased multiplatform games on it that I knew I wanted with the knowledge that more of the games I loved, such as Mario Kart, Zelda, Metroid and Monolith's new game were all well on the way.
Next we have the Vita. I may not be a big Sony fan, but I do like a number of their franchises and have owned all of their platforms sans the PSP. So far here are the games I want for Vita; Gravity Rush, Tearaway and Sly Cooper 4 (though only through cross-buy). That's pretty much it right now. The other games are either sequels to games I don't particularly care for, or ports of PS3 games (or even poor man's spinoffs of games like CoD or Assassin's Creed).
Now don't get me wrong; cross-buy is a great side feature as is the Vita's ability to do off-screen play like a Wii U controller. All that said, these really are not massive selling points for the platform as it is a dedicated device that should be able to coexist separately from its console brethren. In my view, the benefits of having both together should honestly come after everything else.
I want my Vita's library to stand up on its own. More Gravity Rush games. More Tearaway. More new material that interests me (this, I'm aware, is completely subjective). While Uncharted may not tickle my fancy, the Uncharted game for the Vita is at least a new one, so it counts in favor of the platform. Being able to take my games out of my PS3 and play them on the go is fantastic, but it should only be a side feature.
The 3DS is a stark example of this. No one wanted a $250 machine for Zelda: Ocarina of Time and a port of Super Street Fighter IV. One price drop and a new Mario/Mario Kart later, suddenly the platform managed to seriously pick up and is now selling just as well as its HD console competition. The Vita can do exactly the same thing if Sony chooses to do so.
On a side note, contrary to what I'm sure would be the common belief, I did not purchase my 3DS on launch day. I actually purchased mine roughly two days prior to the price drop due to the Ambassador Program promising twenty free games for it. If the Vita does something like that, it will be an instantaneous buy for me.
Anyway, just as what I mentioned above with the 3DS, I'm not quite ready to go for a $250 - $300+ machine for only a few new games I want and cross-compatible PS3 ports, cool as the latter may be. The library needs a little more variety; maybe a new (and proper) Ape Escape to take advantage of the Vita's dual sticks or perhaps an exclusive Star Wars Battlefront game that goes online. Or perhaps a proper portable Jak game.
The Vita is a powerful and amazing piece of portable hardware which is more than capable of coexisting with the 3DS, but it needs a push that I feel Sony is reluctant to give it. At E3 Sony should give the Vita games that are new and unique and provide a much needed price drop and the Vita will become much more competitive. Once this happens, I'll dive right in.