As far as modelling active radar missiles goes the AMRAAM in LO is the same as the R-77, with a couple of figures adjusted.
From reading these forums for a while it seems to me that (ignoring the AFM Su-25 & T):
In LO there is one SFM flight model (carried forward from FLanker), tweaked to suit each plane.
In LO there is one (Fighter borne) radar systems model (carried forward from FLanker), tweaked to suit each plane.
In LO there is one passive radar seeker AAM model (carried forward from FLanker), tweaked to suit each missile.
In LO there is one active radar seeker AAM model (carried forward from FLanker), tweaked to suit each missile.
In LO there is one infra-red seeker AAM model (carried forward from FLanker), tweaked to suit each missile.
Whatever systemic faults one has so do the others to some degree.
Which is why asking for some fixes is impossible without a re-write of the code (of course some fixes don't require this, just a qualitatively smaller allocation of man-hours)
& which is why we should encourage ED fix the easy stuff for LO/FC in a patch (if there can be such a thing in software development) to begin the next series (the Flanker/LO successor) that won't have these limitations, rather than hoping for the present series to 'morph' into something it can never be.
Don't get me wrong - I love LO (ask my girlfriend :-), but there are limitations built into it that need a fresh start to overcome.
regarding this:
It's not that the AMRAAM is So Much Worse, than other missiles, it's just that the people who use it have higher expectations of it & are more vocal