It's all about the benjamins, guys. Every decision they make is to get more $$ from your pocket to theirs.
Video games are a main-stream, big-budget operation now. Everyone is trying to get as much $$ as they can.
"Pay for pre-owned : Fail"
Not for them.
You buy the game for x$, turn it in for $X/100. Someone else buys it for $Y. They still have to pay whomever made the game to play it. And no one had to pay to produce that 'extra' sale....
"No backwards compatibility : Fail"
Not for them.
You don't want to pay for the same game twice? Too bad....
"No transfer of XBLA games : Fail"
Not for them.
Same reason as above.....
"All games need installation : Fail"
Not for them.
Now they can meet any deadline they set: "We'll patch it later...."
So what if the game sucks in the beginning. It'll get better later....
And of course, you have to pay for the priviledge of them fixing the problems (ie, X-Box Live)
"Kinect required: Fail"
Not for them.
Now you have to buy something else to take 'complete' advantage of the system.
Or pay extra to get it with system included

"Voice Commands: Fail"
Not for them.
Recognition software pretty much sux. Voice commands are gonna be slow, and/or require an internet connection.
But who cares? They get bragging rights, as the first console to feature them.....
Though the kiddies will love it. ("What's it do when you say f*ck? How about Sh*t? Cooool.")
"Why not just use my PC instead?"
Why not? That's really all it is. Except it's stripped down (so they only have to support specific hardware).
Look for lots of ports from the '1' to the pc in the future - so you have to pay twice again.
"I don't understand why they're all up on the whole "lets be a media center" thing. "
Because there is lots of money to be made in it, and they want their slice.
From tracking what you play and where you go on the internet (information which they can then re-sell)
to in-game ads (you know they are coming) to small 'fees' for streaming shows to your machine.
There are lots of ways to make money from a 'media center', and you can bet all the game makers are looking for a
way to cash in on it.
...
I disagree with companies trying to rake in every last penny they can (obviously).
Especially when the company officers are not held responsible for the results of their greed. (Get hit with a big
lawsuit? Go bankrupt. Private assets can't be seized. Who cares about the people who work here, anyway)
That's why I don't develop for more modern consoles.
Fun for us is just business to them.
I won't be buying any of the new generation consoles for a long while.....