New
#421
I'm guessing you're near the start, so you wouldn't have much unlocked.
Use the cover system to sneak. if it's taking down a criminal just make sure you see the probabilty and only start to move at the 80-90% mark. It goes goes from 21% to 95% real quick.
The cops aren't GTA types. Becoming a vigilante (good guy) helps with reducing the amount of cops. Level up to unlock steam pipes, helicopter disabling to help escapes etc.
Stand up GTA fights you will lose. It's GTA -esque, but not GTA. Except for online free roam.
If you really struggle, head to the water. Only the chopper can cahase you and once you unlock th disabling skill, you're untouchable.