One reason could be that the base is much smaller than that of batsmen. Ratio is almost 7:4 and so it is easier to select a top 10 from a smaller base.
I think it has more to do with the fact that the subcontinent hasn't produced much fast bowling talent outside Imran and the two Ws. This means that Indian and Sri Lankan fans are a lot more objective about fast bowlers and that SENA fans are judging more on a level playing field.
The problem with batting agreement is that ideal batting conditions are far more origin-dependent than anything else. Sangakkara was a beast in Sri Lanka and merely very good in Australia. Ponting was a monster in Australia but couldn't buy a run in India. So people tend to over rate the players that suit their home countries and under rate those who don't perform as well in those conditions.
A great example is Hayden. He's a player who averaged over 50, scored more hundreds after the age of 30 than any other batsman, scored more hundreds in his first 50 tests than virtually any other batsman and yet many people rate him more like Gordon Greenidge than Sunil Gavaskar as an opener. Or for that matter, take Allan Border and compare him to Viv Richards. The vast majority rate Viv way more highly despite averaging less than Border and having played against relatively easier attacks and having a stronger team around him.
For that matter, it's interesting to see on here the different ratings of Viv and Greenidge compared to Hayden and Ponting. Both pairs of players have a lot in common - both played for the strongest sides of the era, Greenidge and Hayden were both openers who truly flourished with their favourite opening partner, all were aggressive batsmen who favoured pace bowling and yet there seems to be more legend built up around Viv and Greenidge than Hayden and Ponting.
Pakistani batsmen also seem to be criminally underrated by many. Younis Khan in particular gets virtually completely ignored even though he is statistically up there with the likes of Dravid.
The truth is that batsmen require consistency to be seen as good while bowlers, particularly pace bowlers, can leave a lasting impression with a few magical spells that run through your side.
