Nope, Cata was pretty good up until DS. My guild was thriving and doing HMs in 25s until DS. Though admittedly we saw a decline in interest with Firelands. Then Dragon Soul hit with it's almost completely recycled content and boring fights. People lost interest pretty darn quick. People stopped showing up and our core guild which had been raiding strong since Ulduar just dissolved.
I honestly lost faith in Blizzard because of Dragon Soul. I didn't think they were capable of producing such terrible content. Now MoP is here and its a terrific start to an expansion but it's too late. We tried gathering the core but alot just moved on. I want to forgive Blizzard because Mists is really good but they destroyed my guild by releasing content well below their standards.