Using a last name as a "critique" site?

[PeterMan]

Hi,

I just picked up a last name domain that I want to develop into a "critique" or criticism site for a particular person. For example, lets say it is Bush.com (obviously it is not)... Anyway, I plan on using the site to criticize the way this person does their job, etc... I do not plan on blasting the person with slurs or anything like that, I simply feel that this person is not doing a good job and I would like to point out his flaws and back that up with some stats and documented facts. I have never done anything like this before so before I get started I was just wondering if I should be concerned about any possible legal ramifications?

Thanks!