I must say that Infernal Hordes feel much, much better than anything else in the game right now. This is the only game mode that makes me forget how much time I got until the end of it, and instead I focus almost entirely on trying to farm as much aether as I can. When there is no spawn delay bug, I feel like this is the only mode that is truly intense and at times I get overwhelmed by how much is going on on the screen. I would say it’s very good and I think that whoever gave it a feedback during PTR did a great job. If anything else, stuff like this makes me excited for expansion, and this is yet another season that brought me back to the game. I hope it gets expanded upon in future game updates/seasons.
Overall I do enjoy it, and play it pretty much non-stop as my mode of play. There needs to be a few tiny tweaks but overall I will always play this over the Pits.
I nearly pulled off tier 6 last evening. Finally got the last of the three bosses down to 15%, then I popped dead. The fight was so long to that point I was done and spent. Tier 5 I can steamroll. Ahh well.
That all aside, it’s a solid game mode.
1st Infernal Hordes = fun.
10th Infernal Hordes = still fun.
100th Infernal Hordes = 
Once you have to farm hundreds of millions of gold to reroll an item enough times to get 3 upgrades to the affix you want, Infernal Hordes stop being fun.