Wow this topic is a throwback, feels like OP typed this up in late 2013 and only posted now, but I agree I was outside of Trevor's store online recently and I accidentally hit circle and punched the air.. I got a star for it and they shoot me immediately as they arrive.
They got really lazy with the AI and to cover it up they just made the cops super aggressive. No longer will you see a cop arresting or pulling someone over and ticketing them like in IV. Now in V even a 90 year old granny will get pumped with lead because she has an expired license plate sticker. Someone at R* rides to work everyday on a very short bus.