It's pretty much impossible to balance a fight with melee vs ranged without it being a complete Patchwerk-style faceroll. Almost all of WotLK was extremely melee biased. Now they'll go through a trend where it's ranged biased, and towards the end of the expansion I'm sure it'll start swinging back towards a melee bias. This has been the natural swing of raids since TBC as they fail to find that sweet spot where both groups are equally challenging.