I find that I can communicate far better than most through writing. I never really realized it until recently, from reading how other people frequently write. The converse though, is that I am not anywhere near as good at communicating in person, and many of those same people who are unable to communicate through writing are leaps and bounds ahead of me in interpersonal communication. Not to say I'm terrible, I usually get my point across, but I could use a bit of work!
I do have a habit in both scenarios though, of having my point get misconstrued into something it isn't. It really frustrates me when this happens, and it usually happens when people try to read in between the lines of what I say, rather than pay attention to the things I'm actually saying.