Pepsico chief Indra Nooyi is facing flak as the companys shares have reportedly fallen 7% while Cokes share surged 28% since she took over, even as the Indian-born businesswoman was named in the Financial Times list of 50 People Who Shaped the Decade.

I think it is hard to give Indra much better than a C-plus as a CEO, a shareholder was quoted as saying by the New York Post.

Another shareholder said that 2010 would be a critical time for Nooyi, who took over in 2006. I think 2010 is a pivotal year for PepsiCo and Indra. Indra Nooyi has had a tough three years since becoming CEO, said a PepsiCo shareholder.

Several strategy changes over the past three years have left have turned off customers and eroded sales for PepsiCos core products Pepsi, Gatorade and Tropicana, according to the New York daily .

For instance, Gatorades US market share among sports drinks, meanwhile, has fallen to 74.9% from 79.3% three years ago.

The falls in sales is attributed partly to the company replacing Gatorade's name on its bottles with the letter G.