I generally avoid looking at good reviews when shopping due to this. Instead I assume that whatever doohickey I want to buy works as advertised, and look for reasons not to buy. Bad reviews are much more helpful in this regard, as they pinpoint weaknesses or other issues.
It's also much easier to filter the bad reviews. There's fewer reviews to sort through, and you can dismiss the PEBKAC or DOA (except as a data point to see if there's a whole bunch of DOAs).
