Should I play Uncharter 3 without having playing previous titles.

You forgot "potato." Users can cast their vote here:

All of them are good. You should play them all.

You could. Should you? No.

you mean uncharted 3? you can play them in any order. I think uncharted 2 is better, though, but they're all good

Yes, it will be okay.

You can do whatever you want, but I like to know where they have been... before seeing where they are going.

It is best to play them in order. It is a solid series so you won't be disappointed.

Best to play them in order but 3 is the worst of the series so don't come in with high expectations. Uncharted is generic imo.