100% agree. I bought a vita opening weekend just to play the new uncharted game...since it was uncharted I loved it...but then never touched my vita again.
Good suggestions above ^.
The last of us is a great transition game it plays pretty similar to uncharted, but also has a fresh feel to it.
Also crushing mode on uncharted is always fun to test your skills, along with playing the multiplayer.
If you want more uncharted story however there is a comic, a book, and a game for vita. (I'd recommend skipping the vita.)
For me 4 is the best, but it's only the best if you play the rest of the games. I feel like it does the perfect job wrapping up the story.
2 is my second choice and that's where I first started loving uncharted so it has a nostalgic touch for me.
3 is next, although the story is quite convoluted and has far too many plot holes still not bad. I also wasted hundreds of hours on the multiplayer.
1 is in 4th. I really liked it, but I feel the characters weren't quite as developed as they were in the other games. Still solid though.
Then golden abyss if you even count that one. It was pretty bad but of course they made it to try to help out vita sales...which didn't really work too well.