Cup of earl grey and some bourbon creams please.
I think some probably are a bit 'influenced' by the name on the downtube, but more importantly I think that a lot of reviews are just completely random based on how the reviewer feels on that particular day.
After buying a frame which got all 5* reviews, and finding it to be rubbish I checked a lot of frame reviews to find its replacement.
Imagine my surprise to find frames with virtually identical geometry (max of 0.5deg difference on the head tube and 15mm on the top tube length/BB height to be described as various things between 'far too cramped'/'too stretched out', 'too many pedal strikes'/'feels more perched on the bike than in it', 'head angle far too steep'/'slack angles make for a competent descender').
In fact some described as being 'twitchy' actually had half a degree shallower head angle than the 'brilliant descending' turd which I bought on their recommendation.
Not to mention the suspension performance which if you'd actually ridden would surely realise is absolutely useless. Gah.
Edit: that turned into a bit of a rant but I stand by it!