Haven't read ALL the comments on this topic so sorry if i'm repeating anything said before,
I think smarter cops with more force would be great, lets be honest GTA games have never been a real challenge for most players. I mean its easy enough to survive a 6star wanted level on moped or even on foot!
I think there should be different levels of force, as mentioned in the few of the comments I browsed over earlier, I don't want to be getting shot from all angles for resisting arrest or for scraping the side of a cop car, but at the same time I don't want to be only getting a 1 star wanted level for shooting some granny in the head, a few tweaks here and there would be great but I think its just a case of increasing AI inelegance and I have no doubt Rockstar will be doing that!.