Unless you are stuck in a corner with multiple enemies fighting you, a shielder can almost always use footwork to dodge a nudge. It is the rock to a shielder's scissors, but they have an upper hand against other builds and attacks. Nothing unfair there.
The main reason I use nudge is to break a blocking enemy's defense and let a teamate hit them. It's the only thing other than a bonus against shields weapon that trumps a shielder if you are fighting 1v1. Even then, a nudge can push you back far enough to raise your shield again before the enemy strikes (in 1v1, I mean).
