Are Chiefs the worst 7-0 team ever?

My friend Don Van Natta on Sunday Tweeted out that the Kansas City Chiefs are the worst 7-0 team in NFL history:

The #Chiefs are the worst 7-0 team in NFL history, The teams they have beaten are a combined 14-33.

— Don Van Natta Jr. (@DVNJr) October 20, 2013

It’s a very interesting question -- how good are these undefeated Chiefs anyway? -- and as you migh…