He's not too good at listening.
Instead of Winter is Coming I think the Stark's should adopt a "We don't listen" motto. Seems to be their family trait.
I think Ned Stark listens, but he's too stubbornly honourable to actually take anyone's advice. He's a northern man who can't bring himself to play the same game as the southerners, and it's his downfall.
True, but I think to everyone else looking at the way he acts it's easier and more of a 'dig' to say he doesn't listen and that's the Stark problem

I think honestly you can look at geography as to why the Starks are able to be so 'honorable' and why the other houses don't seem to be. Is it just that somehow the Stark bloodline is the only 'honorable' ones in the Kingdom? I don't think so. What I think is that because they're so far North and because even while it's 'summer' for the rest of the country it's still cold up there (even ignoring the frigidness once winter does comes) nobody else really *wants* to be up there.
Getting control of Winterfell and conquering it isn't really that much of an interest for the Lords of the South. Conversely they have to be trickier and use whatever means (no matter how 'dishonorable' they are) in order to secure and keep their kingdoms because they *DO* have desirable lands.
I think all of them have had to play the 'Game of Thrones' for centuries upon centuries where as the Starks have been pretty secure and only have deal with the game occasionally.