If they are reporting a bug in the app one way to prevent this is a help/about that has an e-mail address (or some other contact type--but e-mail is best) and also in your description note that they can e-mail you directly for any changes/suggestions/help -- this generally prevents 1's for bugs-- and you can deal with the "disgruntled" 1'r and calm them down and give them a fix.

That is good advice and works for me. I only leave negative reviews when there is no contact info, or they don't respond when I submit a bug.

Good points.

If an app crashes immediately on start then what kind of star rating would you expect?

I understand that happened but could be happening to a very small percentage of people that download it, and by giving it a 1 star review immediately, it may take people away from it.

That being said, of course I would probably be pissed myself if I wanted to try an app and then it crashed as I started it.

Well, I consider such apps unreviewable, so I wouldn't review it.

+1 :)