Demoing Clover around the world, people often ask me "what do you think is a good coverage %?"
I think the answer applies to most software metrics in most situations. That is, the number itself doesn't matter as much as the trend. I usually say something along the lines of "I can't tell you how well you should test your software without knowing a whole bunch about your project, but it is a bloody good idea to at least ensure you don't make it worse." depending how much beer I've drunk and how long I've been booth monkeying for ...
Anyway, two points:
a) metrics are useful, but trying to compare to some "industry wide" measure is probably not very useful and could certainly be dangerous.
b) metrics over time tell you a lot more about your team than at any moment in time.
 unless you are a consultant selling snake oil, in that case metrics are great ;)
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