My issue with the cops is that you always die. Anything more than 1 star and they shoot on site. I got Busted for the first time yesterday, and only because I deliberately let myself be caught with 1 star to see where the police station was. Under normal circumstances I've only ever been killed by the police, never caught.
I don't mind the use of lethal force at two stars, that was the same in GTA4. The annoyance is that one star seems not to last for more than a few seconds, as soon as the police have eyes on you it's two stars and they're blasting you even if you haven't used any lethal force yourself or even have a weapon visible. It's ridiculous, because then just escalates into a full-blown manhunt and you're screwed.
. Although as per below your post how do they react to going offroad when on 5?

. Wanted to get these Lester missions done but need access to the bawsaq market.
Need to check stock levels fs.