gurpreetsingh
GMAT does not intentionally discriminate. They have to cope up with the standard requirement required by the business schools. English is used worldwide and is considered to be the corporate language.
Yes I would not deny that the Non-Native applicants are at disadvantage, but its comforting to know that Gmat does not measure your vocabulary but measure the ability to write proper English, think critically and comprehend the text.
These qualities are very important.
The native applicant having good Quant skills is likely to score much higher than the non-native having great Quant skills.
In Quant a person can afford to miss 15 questions and can still score above 40, but in verbal if you lose 15 questions even if they are intersperse you will not score above 30. I know many of you would argue that there are lots of other factors as well, I do agree but even if you take best case of all scenario missing 15 questions in verbal will not let you score V30+.( Just an example)
Now even if you score Q51 with verbal below 30, it becomes very difficult to touch 700.
So the bottom line is to score high in Gmat you have to score good in verbal, at least above 38.
This is the discrimination.

+1!
I perfectly agree with you gurpreetsingh.
Yes, it does not discriminate intentionally, but yes, it discriminates unintentionally and the level of discrimination is directly proprtional to one's verbal ability.
So, if English is required, one has nothing to do just to improve her/his verbal skills.
By the way if one scores Q51,V30 it is 670 score.
Well it is debatable, few times during my prep CATs practice I have received raw verbal score more than 30 with more than 15 mistakes.
U're right in saying that GMAT does not discriminate intentionally. As per my experience, there are english language tests that do discriminate. I recently took an IELTS test with the following result: Listening Section - 9/9, Reading Comprehension - 9/9, Speaking Section - 7/9, Writing Section - 7/9. The earlier two sections have objective questions while the latter two are judged subjectively. Needless to say, when they have points for accent (correct pronunciation, among other things), then the tests start to discriminate.