Biggest trouble is quotes in sigs - the damn things have so much unneccessary space between them. I'm aware I've two in mine, and what I want to know is: why can't consecutive quotes be closer together (this is a general point on actual posts, rather than sigs)?
Of course, there's been several recent instances of XIs being displayed in sigs - massive problems have resulted here when posters, instead of listing
One, two, three, four, five, six, seven, eight, nine, ten, eleven
have listed
One
Two
Three
Four
Five
Six
Seven
Eight
Nine
Ten
That should be modified immediately it happens IMO.
If there's no quotes involved, sigs can go up to 15 lines and never even be close to being too long. Nothing short of ridiculous to suggest that 5 lines should be the max IMO I'm afraid. If it bothers you that much you should switch them off.