Or, BnZs, you can just hand wave away all of the strengths of the P-51D and pretend it totally sucks to try to sell your agenda.
Oh wait, that is exactly what you did.
The P-51D is one of the best tools in the game for taking territory. It is fast, carries a lot of ordnance, has long endurance, has guns that are easy to hit with, handles very smoothly at speed and has great cockpit views.
That isn't to say that the aircraft you listed don't also have nice capabilities as well, but to pretend the P-51D is completely overshadowed is silly. As a package deal it is very good.