Dragon Soul is a raid that proved to be very annoying to me lately. Not so much because of the zone itself. I don't dislike it, so I was thinking why I almost burnt out on it. I'm in social, semi-casual guilds, and back in ICC days (the best raid instance in my opinion) we cleared the normal version then stopped there. We never tried to clear the heroic version. In fact I didn't clear heroic ICC until Cataclysm was released. But with DS, for some reason I felt the need to get a full heroic clear. While doing a normal clear was realistic, even trivial now with pugs, thanks to the current nerf, the heroic mode proved to be a whole other ball game. Now I'm sure those of you in hardcore guilds progressed through heroics just like normal modes. But here we're talking about people in DS gear unable to pull over 20k dps, or repeating silly mistakes week after week, or joining a raid and then having to leave for 'RL' stuff 30mins later. The result is night after night, many hours of nothing but wipes. I used to do the hardcore raiding thing and this is exactly the reason I left, after years of progression raiding, it just wasn't as fun anymore, and I prefer to do raids to see the content rather than try for the best loot and titles available.
So in retrospect I shouldn't have tried to push through H DS with pugs and semi-guild runs. Heroic raids for the rest of us are things we do for titles, achievements and mounts, when the next expansion comes along. Just look at how popular H ICC and Ulduar have been in the past year. On my server, there are pugs forming for these zones every week, even to this day. These instances see far more traffic in heroic than they ever did during Wrath. And as sad as it is, when MoP arrives this week, while it allows us to start seeing new content, for most people it also means we get to restart Cataclysm, do all these raids over again, this time in Heroic mode for the meta achievements and such. This is, actually, how most people will get to see the content. I wonder if Blizzard ever thought of it this way?