Are US mains just bad?

I am not the best player, far from it but my friend kept complaining how bad US jets are, how they easily loose energy (Especially the F-15). I am now at the F-15E this jet is GIGA easy to fly. The energy retention is insane. Yes I am still not convinced that the Seekers of all missiles are the same and I will die on this hill as other missiles are almost impossible to notch whereas Aim-120´s only need 1 or 2 chaff but yeah other than that, these US jets are amazing. So I wonder why US mains always complain.