One weakness is that they only test one lens, and some manufacturers (notoriously, Sigma) are prone to significant variation between different copies of the same lens. Historically, Pentax has been very solid, but recently there's been a lot of complaining about getting bad copies of the DA★ 16-50. Whether there's actually a significant variation in new Pentax lenses or just in the critical eye (either too little or too much) of the observers, I don't know. It's too bad some objective site can't test half a dozen samples of each lens.
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