Some items gleaned from other recent threads ... not sure how definate these are (save for the Ta152) but I've seen enough solid evidence presented to be convinced these are worth a look:
109's sustained turn rate may be too low, should be better than comparable Spits based on some test data.
Ta152 sucks rocks. Hard.
190's have should stall violently only with heavy handling (i.e. abrupt control inputs), currently the thing spins out even with gentle handling.
190's may be modelled as overweight (or other things are wrong - see any of Crumpp's postings).
Acceleration rates for the LW planes seem low in general - esp. the 190D9.
Weird Me110 flat spins since 2.06.
Issues with width of cockpit framing on the 109. And while I'm at it, the gunsights on the Yak and La are too far from the eye point or too small or both. The Russian cockpits are like olympic swimming pools with the distance you can zoom fwd and back.