Never cook less than blue (because...really...why bother?) or more than medium (because it's a crime against humanity by those who hate steak).
If you don't get this one and the next one, you may be too young to read this blog. Get off my lawn you crazy kids.
The only quibble I have with this chart is that there are some islands of amazing in north Texas usually hidden away in the Hispanic neighborhoods in Dallas and Fort Worth. There's a guy who runs a food truck that comes through my sleepy little town a couple of times a week that makes good street tacos.