FM2 is very good in stall fights and slow speed turnfights.
if you're fighting a spit5, make sure you merge lower than him to get the vetical seperation, and merge early enough to surprise him.
unless he is a seasoned spit pilot he will continue to revers with a simple immleman or flat turn. use this first merge to win the fight. a spitfire will often turn to stick stirring when pressured, if he is using the plane as a crutch.
fighting a zeke, use the flaps out full and force the zeke to overshoot. do this by merging, letting him think he will out turn you then reverse the turn and scissor across his sights with the throttle right off, full flaps. Unless he hits you on the cross over, you can turn back into him and sit there as he watches you stop in mid air, and spray him as he crosses your guns. he will cross your guns for sure unless you stall out, or he knows what you're doing.
against a huricane...well...you're not really gunna win this one unless you're very good/lucky or playing someone not so good/very unlucky. use the same idea as the zeke and pray he misses imo.
for any other plane you will out turn them no problem, use your sped wisely, when its gone it really is gone.
expect to get alot of assists in MA flying it.
oh...and good luck.