There seem to be quite a few people online who post in all caps. When i see a movie review written that way for instance i don't even bother reading the thing.
Even people on Amazon use that when reviewing books and movies. Usually if i see they posted a review in all caps i vote the review down,lol. Especially if it is a review for a dvd or blu ray which is not out yet.
Nothing is more annoying than people reviewing something they don't own.