My guild is working on Heroic Siegecrafter. I think one of our big challenges is dealing with the crawler mines fast enough. When I watch kill-vids online it seems like those things just melt, but on our attempts they are staying up too long which is pulling deeps off Blackfuse.
My gut feeling is that the melee aren't chipping in aggressively enough. While discussing that the concern was raised about getting targeted by a mine at point-blank, so they are hanging back a bit farther and cleaving (except for the DK dropping a chill-snare on them).
As a frost mage I frozen-orb/ice-lance them, and then blizzard if there are a bunch up to help snare them. But I'm beginning to think I should just single-target nuke...
In any case, any tips/suggestions for the crawler mines for those who have been-there/done-that would be appreciated.