I’ve been looking specifically at Warne v Kumble, as I have always had a pretty high opinion of Kumble (and Warne is acknowledged as perhaps the greatest spinner ever - at the very least you can point to him being one of Wisden’s 5 Cricketers of the 20th Century) and wondered whether my memory is playing tricks on me.
To an extent, Warne and Kumble’s figures are broadly comparable (similar numbers of overs bowled, similar number of matches, etc) - with Warne better in every major category (as you would expect). They are closest on econ rate (Warne going at 2.65 an over and Kumble at 2.69 - so close as to be virtually identical) but Warne took more wickets (and due to similar number of overs did so at a better strike rate), at an average of 4 runs better per wicket (25 v 29) and took more 5 wicket hauls in an innings and had more 10 wicket matches.
However, a lot of the numbers really point towards Kumble belonging in the discussion of the best spinners ever - until you look a little deeper.
The main point of differentiation is that Warne was much more consistent away from home than was Kumble. Their home/away average splits are Warne: 26.4/25.5 and Kumble 24.9/35.9. Kumble averaged above 35 in all other countries apart from SA, WI and Bangladesh (perversely Warne’s average in India is 43.1 - by far his worst mark).
Thinking about this further: it struck me that there are possibly two reasons for this though: first, Warne was a genius who was able to get wickets on pitches not suited for spin and Kumble didn’t have that same ability; and second, Australia were just much, much better than India away from home.
I think Warne benefited from playing in a team that routinely dominated the opposition with the bat, set large totals and, as a result, were able to attack at every opportunity in the field, making it more likely Warne would be able to get wickets. India’s current malaise away from home is not a new thing - they are markedly worse outside India and have traditionally been in fewer positions where they would be able to set similar attacking fields. This has a negative effect on Kumble’s figures. I also think Warne was simply better than Kumble - but I suspect the main differentiating factor could well be team-mates and match position.
The main thrust of my point is this: unlike pace bowlers, where attacking fields will be set at the start of every innings with very few exceptions, spinners are at the mercy of the match situation and thus the ability of their teams with the bat much more than are pace bowlers. This isn’t to say that this is not an instructive thread, nor that statistical analysis of spinners is worthless (I think the figures are broadly correct for what it is worth - the better bowlers generally have better figures and they provide decent pointers as to who was best). I do think though that the best analysis of jsut how good spinners were is probably best done with a tool more sophisticated than Statsguru that looks at more factors than blunt instruments like average, strike rate and econ rate.
All this by way of saying, I think Kumble belongs here, even though the numbers are not as great as people might wish for, for reasons that I think have less to do with his talent level and more to do with the team’s ability that he was in (though I concede that he is probably a second tier player in this sort of analysis - i.e. very good and great in his age but not an all time great). Others obviously differ within the thread and that is fair enough.