There are two very different ways to deal with comments on your blog, mainly complaints.
The first way to deal with complaints is to say "Click Away if you don't like the content!"
The Second way to deal with complaints is to say "Ok I will change X and modify Y to fit your needs, please don't go away!"
Obviously a happy medium of accepting the validity of complaints is where you will most likely succeed with blog comments. However, for some blogs it is better to simply be a jerk or an appeaser. It really comes down to not only the personality you blog as but also how many people are complaining.
Do some thinking on this concept and iron out for yourself how you will deal with complaints and suggestions on your own blog. Will you be an appeaser, a jerk, or somewhere in between?