Sehwag was the greatest flat track bully of all-time, which is not a knock on him, since in conditions that are favorable to him, he was capable of conquering any bowler, pace or spin.
In fact, in terms of batting in the sub-continent, he is the greatest batsman of all-time, better than Sachin, better than Kohli, better than Lara, better than Richards, better than Dravid, since not only does he score more but he scores quicker and that too while opening.
The problem is that in conditions in which there is lateral movement, he is completely inept, hence his poor record in England, New Zealand and South Africa.