I've suddenly started feeling excited for this, after not being so impressed with the demo. I've always loathed action games with no story, but after playing some Uncharted, I'm looking more and more forward to the mission structure of Unit 13. Don't get me wrong, I really love Uncharted, but it demands all my attention, so I kind of have to prepare longer sessions to play it properly.
This seems like great fun, and I love the high score and leaderboard stuff. That's what I've enjoyed most with my other Vita games so far (Wipeout, Motorstorm). Turns out I'm really competitive, just not that much into "real time" multiplayer.