Like most other people, I don't necessarily find my palate aligned with the majority of people on certain wines. In fact, I'm amazed how often I taste a high scoring wine and it really does not appeal to me. So it's nice to have the outlier scores and notes, as these help round out the picture. In fact, it's usually the NEGATIVE reviews and lower scores that I read FIRST.
As a non-Port example, consider a slightly aged Bordeaux that almost everyone is scoring in the 92-96 point range and saying only glowing things about in their notes, but two people have given it significantly lower scores and complain about the wine's strong dill and soy components. This is very useful information for me, as I don't particularly like that profile in my Bordeaux. But perhaps the majority of old Bordeaux lovers don't mind these attributes, so they didn't even bother mentioning them in their notes. Or it could be alcohol level, oak treatment, tannins, or countless other aspects of wine on which there is not universal unanimity of preference, whether it be in Port or any other wine.
Even if it's an outright flaw, such as TCA, it's worth posting the TN, as occasionally patterns do emerge. Same for simple "off" bottles, as excessive bottle variation is something that's worth knowing about.

As a slight digression, I think really useful tasting notes are somewhat rare and take a lot of effot to write. Not because they need to be poetic or clever, but because they DO need to be thorough and mention a broad range of the wine's attributes, giving me enough information to get a sense of whether I'd like it or not. I have to laugh when a reviewer tries too hard and waxes lyrical about a wine he loves and how it reminds him of his first true love and blah blah blah. Dude you are wasting my time as we may have very different taste in women! Not to be too cold and objective about it, but I just want to learn as much as possible about the wine, and for that reason I absolutely want to read all the notes I can, positive and negative.
Tom D.