My first instinct was to disable the motion controls. Stick control alone was terrible because intially there is heavy inertia, and then it accelerates rapidly. I almost always overshot. I ended up enabling the motion controls and it's actually better - I use the sticks for larger movements and the motion for fine tuning (like sniping in KZ2, if I recall correctly).
There is a lot of other touch and motion stuff shoehorned in, not all of which is optional. It's all pretty shit. Think early sixaxis stuff.
As for the dialogue...it's not the worst, but it's clear Amy Hennig was not involved.
Overall I'm enjoying the game - not loving it. Feels quite a lot like the original Uncharted.
The PSN integration is pretty patchy at the moment. Hopefully that's just server stuff that will be ok tomorrow once the system is officially released. I can't really tell whether I'm online much of the time, and every time I go into the game I get a message saying 'the network features have been disabled' - whatever that means. The trophies synch (if I check on my PS3, my level is increasing), but there is no record of vita trophies or games anywhere to be seen.