>they just got unlucky
then let me ask you: as an ethical person trying to write a review, how do you handle that situation? It seems like that's an angle to this that we're not exploring, and that's whether the review is epistemologically justified rather than whether it's objectively correct. The way I see it, as a reviewer I get a product that fails well sooner than I expected it to and I have three choices:
1) Don't report the failure
2) Report the failure
3) Report the failure but try to contextualize it (basically, trying to solve for sure whether they got unlucky or not)
1 is obviously unethical, and 3 seems like it's well outside the scope of a reviewer's duty (and could be seen as carrying water for a particular brand. after all, do you think the person who wrote the OP would be okay with it if his product's failure was considered typical but another product's failure was determined to be atypical, regardless of the truth?). The only ethical approach is to report what happened, and not speculate as to cause.