I've been thinking about passive voice. First of all, what is it? It always avoids the first person. Passive voice can weaken your writing. But there are times when you NEED passive voice. When it's not important for the reader to know who, then it is a time to write in passive voice. Always try to be your reader to determine if you need active voice or passive voice. I have discovered that, sometimes writing in the passive voice can help the story to move like I want it to. A bit faster. If your readers don't need to know who or what is responsible for the action, then passive voice can help your story. Of course most of the time we need to write active.
I don't even worry about this on my first draft. Only in revisions do I decide, if a particular sentence would be better off in active or passive voice. Isn't it true that as we revise, that's when we look for clearness of expression? I always look for the word, by. If I see it, then I know the sentence is probably passive. Not always, but if I see that word, I really study that sentence to see if it needs turning around to make it active. Or if it is okay left alone. You have to be able to recognize when it's okay to leave a sentence in passive voice, and when it's not. :)