Tbh I actually liked Ruby Sanctum. Fast run like OS with unique mechanics for the time (Phase 3) and did require some degree of not standing in stuff awareness. Makes me wonder if so many didn't like it so much was because the gear was basically irrelevant and/or there was no uber epic mount or title.
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MC was good for the raiding standards at the time, but comparing it to Wrath or WoD is bad now considering almost every boss had one, maaaybe two, mechanics that pretty much made the encounters tank & spanks with dispells.
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Yes, they were working on Draenor during MoP and we STILL had a content drought with no filler raid at the end. If they had taken less time on WoD to add a filler raid for MoP during its drought then WoD would be even less worked on than it is now. The same would happen for Legion of Blizzard spent time for a filler raid for WoD now.