That's a good point. Even if the distribution of excellent to horrid developers is the same for India as for any other nationality - and I have no reason to think it isn't - the fact India has a high population and a higher percentage of their population going into development than Western nations means you're more likely to run into the not-so-excellent Indian developer. What you can't do is use the fact they're Indian to deduce a priori how good of a developer they are. You gotta figure that out on a case-by-case basis just as you do for everyone else.