Italian send Fiat Cr42 to France during battle of Britain.They could win every dogfight,but british never gave then chance for it,so they achieved almost nothing there.
Italian better pilots could avoid every attack,but they never had chance to attack themselves.The same goes for africa.
About fighting on Pacyfic - there is great book about it,"Bloody schambles" /Christopher shores/,and i found there fragment of memories of dutch pilot who first used Curtiss CW21,then Bufallo,and later Hurricane.
He said,that CW21 was best of them,and Hurricane actually worst.Bufallo,when mediocrate,was not bad plane in his opinion.
Interesting,why nobody except dutch buy CW21,if it was so good.