It may be difficult to put up a match-winning performance, but it happens. The ones who do are not even rated too highly– after all, many branded Younis Khan and Mohammed Yousuf as mere flat-track heroes. Then we hear so much about India's strong, much-vaunted, star-studded batting lineup, who have never won a Test series overseas, or even in Sri Lanka. Is it so far beyond them to put up match-winning performances? Not if you go by what has been spoken or written about them.
You mentioned TEAM, but if you look at the Indian XI, you would only find the BEST BATSMEN AND BOWLERS, and not a team in the true sense. They have decent bowlers, no doubt, but when you need a burst of wickets, do you get it? Not from this pace-starved bunch. Moreover, they have to slog it out in every match without adequate support, unlike England or New Zealand or Pakistan, who always have one value-add player bowling a chunk of overs, giving the strikers some rest and taking some extra wickets. The batsmen can score runs, but not when it matters– now, how commonly do we hear that? But when one of them needs to bowl a few overs, they don't last longer than six or seven, while the strike bowlers, worn out and tired, continue bowling, without a hope of getting a wicket.
This is why someone like Sanjay Bangar is more valuable than that sixth batsman. He'll bowl enough overs at a good line and length (so, isn't this more important to most of you than raw pace?) for enough time, helping the strike seamers attack more freely. He'll also score a chunk of runs at seven or eight (and also at the top of the order, which is very good), which will add value to the side, along with Irfan's runs. Not to mention, on the back of a good start, he can smash a few big ones. The same can be said of Ashley Giles, and he's doing quite well for England that way. A mere value-add player is their frontline spinner, and not too bad. So why can't a similar player be picked as India's third seamer?