Originally posted by Mr. X:

If you have problems elevating the ground use paved roads. They add some level and this way you can flatten the ground perfectly.
Nothing is impossible if you try and learn how the game features work.

LOL, that's not what the op is talking about at all. The strike zone when swinging a sword, for example, is a pretty thin slice. A mob standing a little below or above your level does not get hit. Same thing happens with tree stumps on an incline - you have to get on the downslope side to hit them with the axe.