you could be right on the the fact that the enemy can't detect the missile since it is using the awacs radar but i think some of it has to do with the type of radar used by the amraam itself. yeah it was you and your wingman against 12+ enemy fighters and your wingman usually sucked. Well no shame in getting shot down by a mig-25 it is one of the russians better older generation aircraft. I dunno if anyone has heard but i seem to remember reading about a short range missile that someone is developing that performs similiar to a confed IR, it memorized the distinctive heat signature of its target or something, i coulda been dreaming or something though.
But I'll admit they're good for popping Stingrays, Skates and anything else which doesn't have decoys - saves wasting IRs!
Modern examples include AIM-9X Sidewinder 2000, Python 4, R-73, ASRAAM, et al.