I've always loved Brazilian teams. '82 - I was quite upset that they lost to Italy. '86 - they lost to a great French side. '90 - went out to a cynical Argies side on penos. '94 - followed them all the way to the title. '98 - loved watching them, only to have the love-in with France grow towards the final. '02 - the love waned. It was almost scripted that they would win it. '06 - beaten by a French team punching way above their weight. '10 - don't remember it, but they were beaten by a Dutch side who would lose the final.
You have to judge any tournament team on their merits. My (meandering) point is that the anti-Brazil posts you see is because they've been so shite. There's huge disappointment, generally, because the days of Samba Soccer seem to be long gone, but not only that, this side is hugely cynical and blunt to boot.
If any side approached a World Cup in this manner (say, Netherlands in the 2010 final), they would get lambasted for it. That Brazil are now in a semifinal, is no great surprise given that they are hosting the event. That they've done so, in such a non-aesthetic manner is their own doing and certainly won't be praised by me for doing so.