The importance of having a voice and sticking to it

BloggingTips has a post on Top 10 mistakes new bloggers make.

Four of the ten mistakes he lists are variations of the general theme of the importance of having a unique and consistent voice. That should indicate to you how important that is.

It's a mistake to
Repeat what other bloggers are saying It's good to talk about the same topics other bloggers are talking about. It's not good to just parrot the thoughts of others. If you don't have something unique to add to the conversation then don't bother.
It's a mistake to
Be afraid to rock the boat. It's okay to voice unpopular opinions if you can back them up. In fact it's not just okay, it's one of the best ways to get your voice heard.
It's a mistake to
Spam other blogs with comments. Make yourself noticed with a few comments on other blogs. But don't call attention to yourself as a bore with nothing to say.
It's a mistake to
Blog on too many subjects. Stick to a focuses subject that you have a consistent point-of-view on. You want your readers to know what to expect and to get what they expect.

Read the whole post for the other common mistakes.