Not true. It's basic math. You get 2x the XP for every kill you get when you're cranked. Plus, games go faster and you get more kills. Plus, you can finish challenges quicker.
I have to agree with Leader on this one.
Search and Destroy is a strategic based game mode and Cranked is another run and gun game mode.
However, the rules in Cranked make it much more exciting and fast paced then your other run and gun game modes.