Shovels aren't uncounterable. But it's annoying because I have to stick to counters and can't enjoy the match.
Shoveling also shows that players don't care about playing, only winning (I stick to shovelcounters not because of winning, I stick to them to make shovelers lose, because that's what they deserve).
Using it on unexperienced players results in cheap wins very often. It just takes the skill out of the game.