I ran across this page today after seeing it linked from an interesting comparison of bug resolution across OSS projects and distros. It’s very worth reading for everyone who uses Bugzilla, on either side of the picture.
BTW, a large proportion of Gentoo’s bugs are duplicates too. It’s not just GNOME. At a guess, I’d put it at 25%, although I may be skewed from just the X bugs I see.
Striving for greatness 