"If I start a blog, I have no control over what they write about me in my blog."
Yes, that is correct, but why should you care? If they like what you do or if they are upset by your business, they'll write anyway. And they'll write anywhere. Like you'll ever control it!
User-generated content belongs to no one and cannot be controlled. But in your blog, you have control over what you write and can use it to speak to your potential customers in their language.
When you get negative comments - what an opportunity to learn! (Cheaper than market research!) And if you show that you are listening and respond, imagine the response you'll get.
You can use your blog to:
- Ask for feedback
- Compliment your competitors (where it is due), and
- Admit when you are wrong.
And then, if you listen and show that you make it better, what are the chances that you'll now have a loyal follower? No guarantees, but what can you lose?