If you can read German, I have come to really appreciate Stiftung Warentest, see test.de. [1]
They conduct rigorous product reviews and try to simulate wear and tear usage of the products. To this end, some reviews take them months. They also come up with their own test suites that are tailored to the product that they are testing.
Even though it is quite costly (sometimes I pay 5€ for a review), I have started to rely on their ratings more and more, as they are completely independent and usually not far off with the end result.
As it stands, currently, their review quality beats internet reviews.