Nothing says novice more than the thought that dihedral is not an important design consideration. For very advanced aircraft with no roll coupling from rudder input, it's getting the proper amount of dihedral that does this. As Dick pointed out, putting the wing on the bottom without any dihedral to compensate for the wing position will make for a very poor flying airplane with adverse roll coupling. Right rudder will make the airplane roll left. A modest amount of dihedral would make it neutral, and more would make it roll to the right with right rudder. The first case makes for a terrible flight feel, the second case is what most strive for, and the third is closer to gentle sport types.