Runes are not gone. Every skill in the game has six runes to them that unlock with your character's level. Also its amusing you can state its easy to get to the level cap when no one has played behind the first part of the first act. It might be easier then "super ridiculously hard" but it will still be a challenge. Inferno is the mode designed as end-game and designed to be the hardest but that doesn't make everything before it easy.
There are parts of the game that may be easy to understand, but you can also turn on advanced modes to such features. Like Elective skill mode. But you make it sound like having systems easy to understand is a bad thing. Like having millions of people able to easily understand and play the game is a bad thing. Its easy to get people in but D3 also has many complexities for those that don't like simple.
---------- Post added 2012-04-22 at 10:30 AM ----------
While you can do everything solo, except for maybe inferno. Everything is still easier when grouped up where at later difficulties it might be "required" to group to have it easier. Required is in quotes because you can still do it solo but it might be more efficient to do it in a group.
Of course the real difference in D3 system is that there is nothing being sold by the developers. Its all player generated items. If no one gets the item to drop then no one can buy it. In this system Real money is literally no different then using Gold to buy the item. Both are currencies and both are being used to buy an advantage your character does not have. Some isn't less legit because they used 1 dollar rather then 10,000 gold to buy that sword.
I feel like a lot of the hate for the RMAH is simply because of it using Real money rather then for the actual system. That anything that uses Real money is so how bad no matter what.