Both Asif and Aamer have got most of their wickets against No.1-6 batsmen. Steyn on the other hand has an equal share of batsmen and tail-enders.
Top order 1-3 - Middle order 4-7 - Tail 8-11
43.5% - 38.2% - 18.0% - Asif
52.0% - 40.0% - 8.0% - Aamer
30.3% - 34.6% - 35.1% - Steyn
So yeah I am dead serious.
So with this logic you rate Asif/Aamer as better bowlers than Steyn? Rubbish. The love for Aamer is all a bit over the top really (at this stage), he was brilliant in the two match series against australia but it was in perfect swing bowling conditions and the first series he has been able to average under 40.
Give him another two years before you put him in the same category as Steyn.
A combination of Steyn/Asif/Malinga (fully fit) would be a gun attack.