I think the part that ticked me off the most is when the 1st 5DMKII arrived, it was like Christmas! I open it up and LOVED how it felt in my hand, much better than the original 5D and I really loved that big LCD screen. I threw some L glass on it and rushed off to take some pics. I then loaded them up on my computer and just sat and stared and said "WTF is this, what's wrong?" Sent it back for another one and this time while the photo's were much better than off that 1st one they still weren't any better than the original 5D. In-fact they were softer and less detailed. I played with every on camera setting in the user menu and nothing helped.
One thing I don't like about the MKIV is it isn't full frame, I really like that on the 5D.