@Teja and Athlai, I disagree and uncannily for similar reasons as Teja posted. During Waqar's time, we had Wasim, the big Westindians, Adonis Marshall, etc etc. What today we've since days of Donald is this modest chap, who on his day, which happens quite frequently, can wreck a lineup consisting of Sehwag, Gambir, Sachin, Dravid, Laxman all in roaring form, on a road.
While I do agree with wpm indeed a measure of how much 'load' effectively a bowler took, shouldn't be the fact that sometimes genuinely capable bowlers are robbed of rightful attention, just because they had to compete with equally good teammates? Unlike runs, wickets are a limited quantity by definition, and if you've some unreal average like 20, they shouldn't be treated any inferior just because they happen to take about 0.7 wicket less per match.