Tanks have several multipliers
HP and Resistances, and in my opinion the potentially the most powerful one, HP regen.
HP regen rewards tanks for doing what they do best, which is taking hits and surviving, by giving them more effective hp the longer they stay in the fight.
Warmog's was actually a big deal for tanks when it came to long skirmishes, and losing it's in-battle power is actually a huge hit (i know it has 200% base regen now, but that's not going to be nearly as powerful late game) in my opinion.
What are your thoughts on this?
It gained humongous sustain, but when it comes to actually tanking damage, it's become that much less effective.