Just tried doing my weekly transmog runs through Ulduar, ICC and Firelands. The bosses there are scaling to my level 70 mage and killing me within 30 seconds. Not sure what Blizz did recently to scaling but it is completely broken for older content in the game, outside of the classic timewalking event going on right now.
Anybody else experiencing this? Is Blizz aware of this issue?
Basically, all of the raids which have a Timewalking variant have their legacy scaling broken (Black Temple, Ulduar, Firelands).
ICC should be working fine, however, as most people are instead reporting the issue with falling through the world when teleporting to the Frozen Throne which implies they made it that far without issue.