Ikki do you really honestly believe that Murali's action has absolutely nothing to do with him being ranked lower?
Maybe some, but I don't know who? I don't think anyone who considers him a chucker would logically think him a great player. By that I mean, I doubt many people say "he's an awesome bowler but because he chucks I rate him less". I think it's a bit more emotive than that and people who think he is a chucker disregard his bowling in general.
I know this sounds radical because high profile match performances receive lot of attention and admiration. But think about it, when pressure applies uniformly, everyone is at a similar disadvantage. And in course of the match someone is going to score lot of runs or someone is going to take wickets. It's not like because there is pressure, the base case is no one is expected to score anything substantial and no one is expected to take a lot of wickets.
Match saving hundred is a different case altogether. The pressure is not uniform on all players of both sides. In Mohali last year when India needed 80 odd runs with 2 wickets in hands, pressure was higher on Laxman than on Mitchell Johnson. So Laxman's knock deserves extra kudos.
I don't think it does apply uniformly - who knows how to gauge that anyway. Just because there is pressure on both teams doesn't make the performances there equal to any other performance - i.e. final vs regular ODI. Players will generally perform worse and it ranges. It can mean worse bowling and batting averages for those matches/series. Which makes comparison with series that do not have these characteristics troublesome - for they do not follow with that same pressure.
Your 2nd paragraph is the perfect logic to refute your position in pretty much every other instance.
Australia, especially in Warne's era, was pretty much always expected to win. Whether that was against SL, SA or WI. If a team lost to Australia, people shrugged their shoulders - because how often did teams beat them anyway? If Australia lost a series there were massive inquisitions and/or droppings. Losing the Ashes was like the holocaust.
Although I don't like this argument as it sounds like I am making an excuse for Warne having to perform under pressure. I think the best retort to Murali being better than Warne against England, in England, is the fact that he never played a 5 test series. In fact, he only ever played 1 3 test series. Also, performance-wise - with regards to the context of the matches - I think Warne was superior. Just look at Murali's series in 06 vs Warne's in 05. The former is statistically better but I think very few people would argue it was better than the latter. Warne's series in 05 was one of the greatest series by a bowler ever.