Nah, they are good for currents, winds, and if your radar is broke dick, but I digress. I never understood the heartburn associated with moboards... they are easy.
I didn't think they were that big a deal either and, at least for me, they made figuring out true winds (or relatives or ships speed) easier in my head. Often times the quick mental wind calculation was faster and more accurate than what I would get from the bridge.