Don't get me wrong, I love the guy and think he's great.
But this modern audience doesn't like people like him. He gets little reaction. He's the guy they'll chant boring at because he's trying to work at a slow pace and tell a story in the ring. This modern crowds of casuals like fast paced break neck wrestling. We mock, but they LIKE the 5 moves of doom.
Simple as that. Cesaro is actually too good to be big in this modern era in my opinion. In the territory days, he'd have been NWA champion and worked up and down the country.