Apparently I am the exception to the rule, but I learned on a Sunfish. My parents bought two of them (they can be found really cheap in good condition if you look carefully), and my mom taught my sister and I to sail them when we were 9. Last summer I got tired of my boat (not exciting enough on average days) so I got a job and purchased a Hobie 14 standard, which is currently being upgraded to turbo.
One guy at the club has a Wave, which he races regularly, and I have found that my 14 is slightly faster. The only problem is that it can't take passengers well. Still, some light kids might be able to sail one. I'm to old and big for that ( 17 years old, 155 lbs), although I did take a friend out once when the race was cancelled (it was blowing 28 mph- fun times).