I don't mind to do a lot of shooting. I mind doing the same sequence of shooting all over again. It is the most repetitive game I have ever played.The first game has aged terribly. When I played through it again in the HD collection last year, I was surprised at how warped my memory of it had become. I'd only recommend it if anyone really wanted to see where it all began, but in general it's better to avoid it nowadays. I mean, those jet ski sections.
Uncharted 2 is miles ahead of the first game in a lot of aspects, especially its characters and set pieces. You'll still have to do a lot of shooting though.
And it is frustrating as hell. The part with the boat when you have to drive against the current, and shoot at people who are shooting at you at the same time might be the worst gaming chapter in the history of games. Until you reach the final chapter, when you have to do the same exact thing 3 times in a row.