You have to remember that when Tom's says "This power supply didn't put out it's full rating", most people don't push their power supplies to the full rated capacity. Most high end PC's draw about 200-250W continuously.
And if Tom's says "This power supply is horribly inefficient", well, most people don't even test efficiency, so of course they wouldn't know.
Tom's has some opinions I find completely disaggreable to the performance enthusiast, but fortunately the stuff you're commenting on is fact (revealed through testing) not opinion. So while I've had my doubts on some articles, I have 100% faith in this one.
<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>