In and Out is amazing.
I live in NYC. BLT Burger ($12+) is better than In and Out, so is Shake Shack (4+), so is Burger Joint ($6+), so is the uber-hyped Father's Office ($10+) in LA, etc., etc. etc., ...but that's not the point people!
In and Out is the master of the fast food California-style hamburger and that fact is deserving of respect IMO. If you want meatloaf on a bun...this is not the place. If you want a backyard bbq burger, this is not the place. If you want gourmet meat blends, this is not the place. If you want the local micro-chain $8 burger, this is not the place.
But if you want California style super-thin burgers with the just the right mix of lettuce, tomato, cheese, onions and pickles then there is nothing better for the money than a double animal style. I have flown to LAS and back on the same day for the pleasure.