Playing through it right now, and having a great time. I can't believe the amount of excellent art design that the team put into this game. Every time I start a new location there is jaw dropping scenery that I marvel at for a couple of minutes.
The story and combat are both fine, I think the two protagonist get along well enough, and there are a few legitimately touching moments throughout the campaign. I also like that the game really emphasizes puzzles this time around. This is the first Uncharted game that I have not gotten completely sick of the combat - which is a good thing!
Overall I think this may be my second favorite Uncharted game (two is still top dog in my book) and for the price I feel like this is one of the better experiences I've had in gaming this year. It's not going to convert people who have not enjoyed Uncharted in the past, but if you were hesitant to get this but a fan of the series, I think it's a steal at $30.