You can do this, but you'd be much better off finding a common connection, perhaps through LinkedIn. No company is perfect, but someone who knows you only through a cold email would be a fool to trust you with criticism of his employer.

I'm not sure why you think that your personal site proves that you're "worth responding to." The problem with your post is that it's all about you - you're not thinking of what's in it for the recipient of your email, or what risks it poses for them.