Trying not to focus too much on just Brutallus here, but comparing a dps check to a boss that require good execution is not a very good comparison
And really.. skill to play your class... one could expect that the only times such things come into use is when you have to use them (like less used abilities) to perform as good as possible even when boss mechanics are trying to stop you
Maybe I'm being stubborn, or reading you incorrectly, but when I hear that fights with less mechanics somehow would require skills at the class, and fights where you aren't free to stand still and roll your face on macros doesn't, I have to rebuke.
Perhaps there is some truth in the idea that too many mechanics (what is too many?) can be a bad thing, but I cannot agree with the notion that a boss merely hitting hard with 2 raid mechanics (really, take a look at bosses before Ulduar) and healers have to spam greater heals require skill to play, when fights with things to avoid and plan for doesn't
edit: I think I just said the same thing 3 times with merely slight variation or points, yay me.