I don't know how to compare Indian and US democracy in a short space. Democracy has too many dimensions.

However, you assessment of US democracy seems to be pretty optimistic. There's a project at Harvard, called the "Vanishing Voter project". It monitors the perceptions of the electorate on a wide variety of issues.

Here's only one study from the website on the 2000 election:

The Shorenstein Center poll revealed that an even greater number (87%) of respondents felt that "most politicians are willing to say whatever it takes to get themselves elected." Moreover, half of these respondents believed that none of this year's presidential candidates was an exception to the rule.

I would say, hardly a vision of a successful democracy.

That's not to say that US democracy hasn't had many successes to it's credit (so has Indian democracy in many ways). But your analysis seems to me very simplistic and ignores the many factors.