Sehwag's sufferings outside asia are exaggerated, probably because he destroyed his numbers in the end by continuing to play after he became deadwood and people remember just his struggles after 2010.
He averaged 41 in the last decade outside asia, which is more than decent for an asian opener especially when you consider the impact he brings with his strike rate. People forget that opening outside asia is the toughest job in test cricket. Compared to Sehwag, the other asian openers in the same period averaged:
Attapattu - 39
Wasim Jaffer - 29
Imran Farhat - 27
Salman Butt - 27
Jayasuriya - 18
Heck, middle order players like Younis averaged 41 and Sanga averaged 43 in that period. Mahela averaged in the mid thirties.
And they were not all just short 30 (35) knocks. Remember him playing 150+ knocks outside asia. Guy got out trying to get to his 200 with a six at the MCG. Funnily enough, he has the same number of tons in England, Australia and South Africa as the "ATG" Younis (that including the dead rubber one here at Sydney). It's almost like Sehwag like players are criticised for their brand of play even if they taste success outside of their conditions.