Well, I've never been a proponent of "raid" bosses in GW2. I thought that GW2 was going to be different kind of MMO than that, but I guess they finally had enough people QQing about raid-like content that they decided to start devoting resources to it.
Personally, I don't like it at all and I hate the fact that they've tacked on something useful as the meta achievement (rather than another stupid back piece skin) with no other means of obtaining it than participation in said encounters, which I'm sure was done on purpose. Now they can claim it was a HUGE success just looking at the metrics like they seem to do with everything else.
Then again, I really don't like these 'specialized' patches. I prefer it when they have a little something for everyone to do, not "this patch is for the dungeon crawlers, next patch will be for the WvWers, next patch will be for... people who really love clicking F a lot." Somewhere along the line they lost the variety the LS updates used to have.