@Arkandel To be fair, there is one circumstance I'm generally cool with it -- if someone is leading a meeting or giving a performance and there's some reason their poses need to stand out as a matter of convenience in a huge crowd of deathspam, for instance. It's actually helpful and useful, in that case.
It's things like going to the square in Shang and seeing someone posing pink, another cyan, and another yellow that makes my head spin and then there's frothing and wanting to kill things. 
(Edit)
@Apos It's usually the simple '' code for bold or italic. It's not much more invasive than the other random punctuation used to denote emphasis in text, but it gets especially annoying in the wiki code configuration because depending on your font, it's easy to mistake it for quote marks at times unless you're looking closely.