I can see both points of view. I like the game fresh. Last night, we entered into Gav Daragon with an 8 man group and pretty much did the whole place in normal mode, which equates to WoW LFR as it was incredibly easy. We were set back by buggy encounters, doors that won't open, and bosses that won't reset properly (Soa).
We didn't do any readups or look for specific mechanics before attempting the fight. We just kind of tried to avoid them as we went. I can see why some people may consider tools like DMs or TMs to lessen the risk of trying new content as well. You suck? Remove you from raid. This one sucks? Replace with better. It was all new last night without tutorials and video guides for our purples.
However, certain classes REALLY need mods like Powerauras, or an in-game mod like Powerauras. It is absolutely horrendous sitting there looking at your bars for procs. It completely detracts from the fun of WATCHING your abilities go to work on a boss. You end up just staring at CDs from bars, procs on top of your buffbars, and making sure you're not standing in shit.
"Oh ok, I'm still on the boss' ass, let me go back to looking at my bars."