Honestly, it's a fun expansion but cannot possibly be taken seriously. The rules are ludicrous (especially the "Catch" rules) and the tiles looks silly (and are somewhat confusing). But, if you want to play a bit more silly game of Carcassonne, I recommend it for that. When I play, I set aside any aspirations for a fair game and plan to have chaotic randomness thrown in. Basically, you just can't play seriously, but it can still be fun. Mega Carcassonne should NOT contain this scenario. It should only be played on a small board. Otherwise, you won't hit anything.
Actually, my friend and I used it in mega-carc and he suceeded in knocking out the same farmer with just about every go (but I would always put it back...)