Try searching for "dishwasher reviews" - it's all spam. And by spam I mean, if you go to the actual links, there aren't any actual reviews.
Part of the problem is that people don't tend to review appliances online, so there is nothing for google to find even if it was perfect.
And the appliance makers make it deliberately hard - the same model has a different model number depending on where it's sold (which is done to prevent people from price matching).
There clearly is spam, but it's not a garbage dump.
Dishwasher-review may also be unnaturally high in the SERPs because of its close matching domain. And I'm not giving Buzzillions the benefit of the doubt.
Epinions, CNet, and HowStuffWorks are also spam. Because they don't have any actual reviews, just lists of models, and a buying guide. (Although the domains themself are obviously not spam, just the results for this subject.)
ConsumerSearch and Consumer Reports are the only real results.
You're one click away from reviews on Epinions and HowStuffWorks. I'd say the same for CNet, except the first 3 dishwashers I clicked had no reviews, just a template dishwasher buying guide, and so I gave up. Of those three, only CNet comes close to spammy... but CNet's dishwasher buying guide is at least decently written.
I haven't found any reviews yet on Epinions, and I've clicked more than three times. They do have a nice side-by-side feature comparison feature, but reviews appear to be entirely user-driven so if no one has posted a review you won't find one.
Part of the problem is that people don't tend to review appliances online, so there is nothing for google to find even if it was perfect.
And the appliance makers make it deliberately hard - the same model has a different model number depending on where it's sold (which is done to prevent people from price matching).