I think funkedup hit the nail on the head...or hit it as close as possible anyway. AH has a pretty potent radar engine that allows folks to really pick and choose where its safe and where it isn't. This of course works in extreme's, from the massive green hordes walloping the 3-4 odd red dots, to the ability to track friendly blips even when out of your own radar range (I see 4 friendly radar blips off my nose, there's 5 dots there, based on positioning the high dot is the enemy...pretty basic stuff).
In the end though I'm never surprised by a dot. I always know ahead of time what it is. Moreover I'm always fully cognizant of what I'm flying into insofar as numbers go even if I don't have the ability to see unfriendly radar blips.
The other side to this is that the radar does help keep the fights a bit lower, theoretically anyway. I'm not sure how much an issue that is now though as I constantly come across Spits in Space, parked 10k above my 15k e-fighter. Without the present radar I'd think that one would see a lot more folks heading for the heavens at the sight of a simple dot.
Vortex