Judging from the time I have spent in AH2 so far, I'd say they can't be trusted. Some planes have changed speed and climb wise and some have just changed acceleration and maneuverability wise. The G10 seems to have a tougher time keeping up with P51's at the deck while the Dora have them both beat when it comes to speed.
The P38 feels alot faster, atleast at the deck etc etc etc.
Hopefully we'll get new charts soon, for the time being, the speed and climb charts will atleast give an estimate I suppose, quite few planes have had climb/speed performance drasticly changed.