Because that is exaggerating it a bit.
Of course the majority of 2000-2010 period has had alot of flat pitches. But when Steyn started to peak in April 2006, he has bowled on ALOT of bowler friendly pitches in the last 4 years in almost every series he has played. So in reality its not as if he had to bowl on roads all the time.
So one can say in the last couple of years along with revival in quality pace attacks amongsts the top 8 teams. Revival in helpul pitches has been seen.
2010 has seen ALOT of bowler friendly pitches worlwide than flat pitches too if you think about all the series played this year.
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Interesting that you rate Donald in your top 5 quicks of al-time.
For me when rating grate fast bowlers in a possible top 10, the top 4 are always Marshall, Lillee, Hadlee, Imran.
Then from there its highly subjective from # 5 onwards with the likes of Ambrose, McGrath, Donald, Wasim, Trueman, Lindwall
The main thing about him is he picks up a wicket every game. Rarely he go without a wicket and if he does he is very economical which usually show batsman or teams use a strategy to see him off rather to try and score of him. Philander is a accurate wicket to wicket bowler and Morkel gets a lot of bounce. Peterson seems to do fill the spinners job nicely with his dibley dobleys
Steyn's not really economical though...Of bowlers to take over 200 wickets, only Brett Lee (3.46) and Chris Martin (3.37) have higher economy rates than Steyn (3.35). Mitchell Johnson is also 3.35.
Steyn's strength is the amount of wicket taking deliveries he manages to bowl, not tying down batsmen. That's why he's got one of the best strike rates ever, but not the best average ever..
Hey I'm not saying Steyn isn't a good bowler...happy to acknowledge Steyn's awesome strike rate.
But Steyn's economy is still above average even if you take into account modern play. Overall economy rate since 2000 is 3.20, so by definition, Steyn' 3.35 RPO is more expensive than average. But when you whittle down the high wicket takers it's more obvious. This table shows fast bowlers who've taken 100 wickets since 2000. There's 31 bowlers, and Steyn has the 8th highest RPO, so I wouldn't class him as an economical bowler, even by modern standards.
Bowling records | Test matches | Cricinfo Statsguru | ESPN Cricinfo
It seems I'm looking at economy rate, you're looking at average. eg. Anderson clearly has a lower economy rate than Steyn in that comparison you made. But Steyn's strike rate and average are better.
Oh well, it's been fun