So I just got the Shattered Timelines expansion, and we had a similar sort of experience, with the Chrono-Ranger taking out Iron Legacy, mostly because the dead Tempest (I think) kept making Chrono-Ranger immune to melee damage. At that, it was a very close thing.

I think the version of Iron Legacy I played against at Randycon was a prototype called Super Legacy, which seemed more powerful to me. As it is, this one very nearly did us in by round 2, and I think if any other combination of characters had died, we wouldn't have had a chance.