Im trying to keep the reviews consolidate here.
Personally- I find many of the aspects of D:I solve some of D3’s deficiencies.
Example: the the rift to get on the Leader Board doesn’t grant XP.
On the other hand, I don’t like the idea of limited bounties. Maybe decrease the amount of rewards as the number of bounties are ckeared.
I am still impressed with D4’s ability to hop in/hop out of Campaign Mode.