pretty much this.
i'm stuck in MSV on my warrior because i cba to grind out rep dailies, however, i can now grind out 489 epics in my own time at my own pace - either by grinding mobs, tracking down the crashed carts or by teaming up with the huge swathes of people killing the commanders.
it's a much faster way of bridging the gap between hitting 90 and hitting ilvl 470 to get out of MSV. if only for the sake of variety - i ran MSV 6 times last week, 18 bonus rolls, 6 normal rolls, 2 pieces of loot
i'll probably do it for quick valor on my main at peak times, by killing the commanders - but i will grind it out on any alts that dont yet qualify for HoF/ToeS. also, the quest to go up mount neverest that rewards 502 boots comes off the back of this questline, which is well worth doing on alts (even if you dont grind out the weekly).
it was also nice to see people cooperating in barrens chat to track things down and kill them faster.
to poster above: radical mojo BoA would be nice tbh - it's 1 per week per toon, so it's not like you can get a full set of gear in a week without putting in an assload of effort to grind all the mats. it's doable, but you'd need a bunch of level 90's for starters and a lot of spare time.