Masha is ranked No.1 as the top talent power in Japan again in the Nikkei Entertainment's Quarterly Talent Power Ranking, according to the latest survey in 2011/02 done with 1,278 people. He took first place in Feb last year and has ranked consistently in the top 2 throughout 2010. See the chart below, taken from here.
A summary of Masha's previous ranking is as follows;
2010Feb - 1May - 2Aug - 2Nov - 2
2009Feb - 5Jun - 6Aug - 8Nov - 4
It's a power ranking. Basically the survey is done to check who's the most popular, the most influential, the most in demand in Japan currently. It is done to determine the strength of the celebrity so that those who's looking for endorsement for their products can guess which celebrity is for them.