No One Likes a Backseat Driver
This one is fairly straightforward. There's a reason why you are the passenger and not the driver - newsflash, you're not driving. Don't tell the driver how to get from A to B. If you were that concerned about the route then you should have just driven yourself. It's annoying and just rude. Besides, Uber drivers have to follow a specific navigation that is done through the UBER system so save your breath because 'oh my god, whyyyyy are you going this way' is only going to piss them off and land you with a low rating.