There are many different types of color blindness. And it's true that some types will make things that appear similar to people with normal vision highly contrasted.
Yes, but when people go "I can tell the difference and I am color blind, therefor they are bad!" ... are either lying or have no clue what they are talking about. They may not be able to distinguish some colors, but just because they have no problem doesn't mean people who can't are bad. Someone with such a condition, I would hope would at least understand that. They see the world differently than normal sighted people, they literally can not make that statement and be honest about it if they understand anything about their condition. In fact, anyone can see how color blind people see, it always changes how they see color ... unless they completely color blind (black and white world) ... they will see colors differently.
I'm fine with the "one person can wipe the raid" thing if its a mechanic that the rest of the raid has to do, too. Malkorok, for example, is one of my favorite fights. One person can screw it up, but everyone has the same task, and its a very simple one at that. Puddles/smash/breath of Y'shaarj is a good way to see who's dumb and who's not. However, if it's a very specific task that's placed solely in the hands of one or two people (i.e. Magmaw chains, Siegecrafter belts, vehicle fights), then that's when I have a problem with it.
I like that though. In a raid, you should be confident that, no matter who a mechanic targets, they can deal with it.
Sometimes you just have players that are not...... smart I guess at handling the certain mechanic. It gets a bit frustrating when it lands or falls on that one person and they screw up almost all the time =/
Personal most hated mechanic? Mounted combat a la Malygos. I can't figure up from down, left from right and
I was always, ALWAYS, the first to die. I outright stopped doing that raid when it was current b/c of those damn drakes.
Even if he was the stupid raid weekly quest I would not go. I still won't go even to farm for the mount LOL. Hate.
My most hated raid mechanics are ones that randomly phase a single player to another area and then has them complete a mini-game where failure = raid wipe. Even when the task is simple, these mechanics are annoying because it can take so many wipes before everyone has had even 3 tries at it. I wish that when blizzard implements these things, they would make a practice it daily for people.