Asif. It was discussed in detailed at the end of the Kissan thread also. You can check there. Lot of bloggers have written articles about this - Deepak Karthi and Subhorup being two I remember. After lot of thinking on this my thought is this.
1. Good or bad is relative. One man's food is another's poison. So absolute judgement can not be passed.
2. If you are a person who just love writing like watching movies, you just create a blog and write. Don't do anything else. Nothing else matters. You can even just write in your diary. Or use blog if you like to see your writing online with pictures and all.
3. If you want to build a reader base - every reader counts. Different readers come with different purposes and every reader matters. There are people who come through sites like this. People who vote for you so that you vote for theirs. People who comment so that you comment back. The more votes you get the more likely you will be on front page. More comments you get, the more you will look like someone is a popular writer. Whereas the people contributing to both these may not be genuine readers, the end result can attract genuine readers. Once they come, you can retain them only on the basis of quality of content. Once you retain them, number of visits goes up. This in turn increases traffic which will increase search engine rankings which will again bring traffic which will catapult you to fame. On the other hand if you get votes and comments through PR, but content is not good, you will only have that with you. Genuine readers will come once. If they don't like the content they will never come again.
4. If you want genuine feedback on the quality of your writing, you have to reach out to people who you think are good writers. Give genuine sincered comments yourself on their blog, establish a rapport. Once the comfort level is established they will give you honest opinions on your writing.