I've never played Uncharted, but I know Naughty Dog should have stuck with Jak and Daxter.
well thats your opinion and i respect that, but in my opinion uncharted was better than jak, but they they never should have left jak, they should have done the same as insomniac, make both series instead of only one
Naughty Dog hasn't sold the Jak franchise to anyone yet. The only reason why the last Jak game was done by a different company is because ND was really occupied with Uncharted 2 last year.
It's quite a shame that Naughty Dog doesn't work on multiple projects at the same time like Insomniac does, but then again, ND is the type of game company that pays attention to build an impressive presentation for their games. The Crash Bandicoot franchise were a success during it's time, the Jak series was enjoyable throughout, and they've done it once again with Uncharted too.