I mean the main problem with complete bunsens is that it makes some otherwise very ordinary bowlers suddenly extremely dangerous which doesn't feel like it's great. Regardless of whether it's a rank turner, a massive greentop, or a complete road, a pitch becomes a poor pitch when it obviates the difference between the mediocre players, the good players, and the great players. If a bloke like Kuhnemann, who with the best of wishes isn't exactly a world-beater (not even in his state team right now), can have the Indian batsmen in all sorts at times, is that really a reasonable Test of a batsman's skill? And likewise, is success on those pitches that much of an achievement? Likewise if any old fool can show up to a four-lane highway and make a hundred, then how much of an achievement is it really to average 50 on those decks? These are all perfectly fair questions to ask.
That's not for one moment to downgrade Jadeja or Ashwin, who are spectacularly good. But it is a knock on that next rung down, particularly Axar, who I think everyone now agrees is kind of meh as a Test spinner - certainly not in the class of the former two, by a long shot - and yet I'm pretty sure his Test average is still sub-20.