The good news is that (supposedly) the map design will be more linear and less vertically oriented than it was in MW2. Fewer places to hide, more emphasis on whether or not you can place rounds quicker and more accurately than the bad guy. If it turns out to be true then you really shouldn't be very dependent on radar to find targets. It will be very obvious which side of the map is theirs and where they'll be coming from. Perks like assassin may help certain individuals stay less conspicuous from the crowd, but its not like they'll be able to play hide and seek with you as they might have been doing in MW2 and Black Ops.
In a best-case scenario the streaks will have been downplayed to such a degree that it really won't be terribly appealing to devote your perks just to avoid them.
As of deathstreaks, I still say that they simply shouldn't exist. All they do is introduce more random hazards into the system, which is the last thing it needs. If they must exist, I say that the death count to trigger any of them should be doubled. Yes, you heard me, doubled. They should only be taking effect when someone is losing THAT badly.
