I mean, gaijin has accepted several bug reports for the AAM-4, and they have said they’re trying to fix the MICA’s range. IMO, there’s not too much issue as it currently is though. The R-77-1, Aim-120A/B, PL-12, and AAM-4 are all somewhat close to each other currently in game, and the Mica fills it’s own unique niche.
Yes, some missiles aren’t up to par, things like the R-Darter/Derby/R-77. But lets look at each of them and what planes they’re on.
R-Darter: The Missile that probably is suffering the most, is literally just a very slightly heavier derby, and unlike the derby, the few planes that (only) get it aren’t lower then their AMRAAM wielding counterparts. (Additionally, it’s on the fewest planes, and those planes get the least of them, leading to you seeing even less kills with them)
Derby: Honestly a bit worse then an AMRAAM, yes it can turn marginally tighter in some scenerios, but honestly a downgrade, and the thing is that’s actually reflected in game, it’s lower in the modification research trees to amraams, and planes that only have it (the F-16D barrack II, Kfir C.10), are actually a lower BR then it’s amraam slinging cousins (13.3 vs 13.7 in the barack’s case). Now, 14.0 does eat up all of these BRs, so that’s kinda not that great, but once the BR cap raises up a bit more to pull the pressure off of it it will actually be a bit worthwhile.
R-77: As the main large red team competator to the aim-120, it’s honestly not great. And it’s implementation is about as fair as possible, sure it’s drag is to high, but it actually lofts in game unlike irl, which actually helps it’s not great range out a decent bit. While yes, 1 to 1 it’s worse then an amraam, you also need to consider the fact the platforms it’s on are missile busses, a Su-27SM carrying 6x R-77s, 2x R-27ETs, and 4x R-73s, to a F-15C’s 8x Aim-120 loadout. While a worse individual missile, flankers make up for it with a large overall missile kit. And the R-77-1 does exist as a more individually strong rival to the amraam.