Everyone remembers the mercenary mechanic from Diablo II.
We were all told there would be a system like it.
We get followers and we're told that they're really for entry level game play only, and become substantially weaker as the game goes on to "encourage" co-op game play with 3 other people.
Everyone is mad because they were looking forward to something more, something that would be relevant well into the "end game" of diablo III
I'm going to assume the number of characters present on screen has less to do with it feeling chaotic and more to do with processing limitations.
The limitation of only 4 players is a return to how the Original Diablo played, and I remember enjoying the game play without ever wishing for more people, but I remember having more fun in Diablo II because I was able to interact with more people rather than having to break from a game and rejoin one all the time. It's going to be a bit of change going from more people to less people again, and I think it will severely cut down on player interaction, but that's just my opinion as terrible and wicked as it may be.
I just don't know how this will all pan out.
I mean sure once we get there we'll be so distracted by storyline and getting to the end and beefing our characters up, but once we're there being able to share that experience with only 3 other people at a time sounds very boring on paper....
I have high expectations for the level grind, and low expectations for the end-game at the moment.