Hi good topic,
indeed mud in these low land regions tends to spoil all the mtb-fun; resulting in more time spend on cleaning instead of biking. Plus I hate the noise of sand and mud grinding and eating a way through your expensive derailleur setup. And even worse: after an hour plowing through sticky mud the system does not even shift properly anymore due to the concrete like structure of mud and leaves (an ancient form of a 2k raisin they used to build houses from!) completely immobilizing your front derailleur leaving you screaming at the darn thing while not making it up that short steep hill.
my 2 cents
So hereby my recent solution to the problem: a cheap steel GT with alfine 8 hub and Hebie chaincase. Weighs a ton, but other than that it's brilliant.