When testing a development branch of Ubuntu, apport shows about ten windows per minute. That's not user-friendly at all. To avoid this problem, I think I'm not the only one to do this, I disable apport repports, so I don't help developers to solve background bugs, but only to solve visible bugs.
I think we can improve apport to make it more user-freindly.
There are applications crashes (eg 'Sorry, the program "APP" closed unexpectedly') and others crashes repport which gives no name and are shown so often.
Applications crashes may be reported and then hidden asking to do not show futures bugs of these versions of the apps, but anonymous crashes are often repported to user in testing release, they seems not be closely connected, and these are the kind of bug repports which are so intrusive, and shouldn't be displayed in a toplevel window because of their number.
In the hope it will answer to your question...