You have got it so wrong that I don't know where to start.
1. Ashwin averages 33 in England and scored 43....and 46* in a Old Trafford pitch where the ball was swinging like crazy in first innings. Check cricinfo scores of that pitch.
2. Ashwin has played extreme clutch knocks in Test that are more memorable. And he plays in rank turners and regular spin tracks of India.
2011 - Ashwin walks in with India facing the possibility of follow on against WI and scores a 100 and bails us out.
2012 - On a rank turner Mumbai pitch, Ashwin walks in at 130-6 and scores a 65 odd taking India to 330 along with Pujara against Monty and Swann.
2012 - India are lying totering facing innings defeat and Anderson is reverse swinging like mad in Kolkata and he scores 91* defying Anderson, Finn, Swann and Panesar.
2013 - Shillingford with an illegal action runs through our batting lineup and India is stuck at 150-6 with Rohit at crease. Ashwin walks in and hits 124 with Rohit scoring a double century and we win with innings defeat.
2014 - Eng, Aus tour knocks - decent contributions though could have done better
2015 - India is in a bit of a bother at 179-7 with a lead of 279 on a flattening pitch where more is needed. He scores a crucial 58 at no 9 and takes us to a lead of 360. And then came out and won the match with the ball. SL scored 268 in 4th innings. If Ashwin had got out, they were par which means match would have been super close and we could have lost the match and series. It was THAT important a knock.
2016 - Walks in at 236-4 against WI with only Saha, Mishra and 2 tails left. If he or Kohli gets out, we will be bundled out for 300 on this track. Scores a 100 and gives us an innings defeat.
Its not a comparison.
Ashwin is world renowned for his knocks especially in clutch situations. He has his flaws (in batting) but has done very well.
And by the way, he saved a test in Aus batting out crucial overs with Dhoni.