So Richard, tell me - how good was Viv Richard's technique or Javed Miandad's technique ?
Technique is utterly irrelevant.
What matters is what your balance is when you make contact. If you watch closely, you'd see that Sehwag has excellent balance at the point of contact - head is still and weight distribution is stable.
Which is why you often see batsmen with dodgy techniques doing quite well ( Viv was the prime example, Gilly's technique isnt too flash either. Same with Sehwag and Lara's technique is flawed) and batsmen with perfect technique failing abysmally ( SS Das, Darren Ganga, Carl Hooper, etc.)
Sehwag has done rather well against the full strength Aussie attack and in that series, Bangalore was neutral ( wasnt a spin-paradise) and Nagpur was more seam-friendly than most wickets outside the subcontinent by recent trends...
And yes, i would rate Sehwag ahead of Anwar,Slater, Kirstien, etc.