Yes it is. I'll say it again: R27 sucked in real life -combat-. Now, we can argue the parameters, how, what, when, under what condititions etc..And indeed, if those missiles were launched from too far away. As I said, if monkeys were flying those planes, totally ignorant of how the weapon system works then ok..let's just dismiss the whole EE conflict. But, those were trained professional pilots (at least on one of the sides if reports are to be believed) and they, presumably, knew what they were doing.
It would be curious if the missile was so badly managed during the conflict, but..everything is possible.