The Blizzard style of stat tier to tier is very worse. Let's go from 10 STR to 100. Right this breaks the game long term. WoW is a sea on bad gear design now. Let's have gems go from 50 INT to 500. There's nothing inbetween?
Everything in ID is a upgrade. Upgrades don't have to be huge. This keeps things in check. They are trying to keep crit in check by not letting you crip cap easily. A good thing.
Each tier should be better and it is. Not hugely better but again a good thing.
Now where they are placing the gear on what bosses could be better I'll give you that. Weapons should have come off the first 4 Bosses. And the Heart drop epic off the last one being it's epic and shouldn't be had by everyone.