Nice as a default rule.
But rules are made to be broken. When they're broken without regard for the effect on the overall design, then feel free to trot out the censure. When they are broken by capable designers, then you can go stick your legalistic view of web page design in a pig.
Many fears are born of stupidity and ignorance -
Which you should be feeding with rumour and generalisation.
BOfH, 2002 "Episode" 10