When I first read that a weekly raid quest would be introduced in patch 3.3 I was very enthusiastic about the idea. Finally there'd be a reason to do all the WOTLK raids again, even if nobody was running them for their gear drops anymore!
From what I've seen in my guild, this weekly raid quest has been a resounding success in practice too. As soon as a new quest is out, groups for it form left and right, and then again because people want to do it on their alts as well. However, me personally? I haven't completed a single one so far, and it's not for a lack of grouping opportunities. I actually ended up disliking the whole concept!
The thing is, in the past few weeks the weekly raid quest on my server has been Ulduar three times in a row. First it was for Deconstructor, then for Razorscale, then for Flame Leviathan. So what did people do? They quickly formed a raid, went to Ulduar to kill just those bosses (they are all right by the entrance after all) and then went home again. It's encouraged people to go back to an instance they were starting to lose interest in, but only to kill the first and second boss, which I find extremely unsatisfying. When I go into a raid, I want to clear it, or at least make a decent effort at doing so. Going in with the expressed intent of just killing the first one or two bosses feels wrong to me in so many ways that I find it hard to describe it. Imagine if the daily random heroic gave you frost emblems just for killing the first boss in each instance. Nobody would ever run a complete heroic again!
I really think that Blizzard made a mistake in making those raid quests all about the entry bosses. It's like the weird loot issues with Trial of the Crusader all over again, where a way too easy and bland raid made a much more fun and interesting one completely redundant by outclassing its loot by a mile. It felt wrong because the best rewards came from something that was extremely easy and thus encouraged you to skip a lot of harder content.
Blizzard managed to make heroics relevant and popular again by rewarding you with top tier emblems for their completion. I thought that they would do the same for the "old" WOTLK raids, but in fact very little has changed - people still skip most of the instance because the emblem reward is given out right at the start. Why bother with killing any more bosses if the effort will result only in minimal rewards compared to just taking the time to kill the quest boss? I can only imagine that getting a "proper" group for any of those raids is now going to be harder than ever, because unless you manage to pull one together on the very first day after the reset, half your guild will already be saved to a dozen different raid IDs from pugging the first boss for the weekly quest.
Printing plastic orcs - 4 years later
10 hours ago