There are so many reviews out there... but I'm sure you've already waded through them. Just like any body you can find people who love it, and people who don't.
I have a D300s I use only for news and sports and I love it. I'm not afraid to drop it... get it wet, dirty, etc. It just keeps going. Speaking of speed however I'm thinking the lens has a lot more to do with it then the body. The D300s with a 70-200 (or the 80-200) 2.8 you can shoot most night sports without an issue. I shoot a lot of high school soccer at night with it, which is one of the worst sports as far as speed and lack of light. For surfing you'll want something longer... For skateboarding something wider.
It's sensor does fine with landscapes. I've grabbed many an after-storm sunset with it using a variety of different lenses. A lot of landscape only photographers want a bigger sensor... but hey if money was no object right?
It's a great body that you can get for a good price considering the features you get.