While it's sad to see anyone lose their job, I haven't liked any of Galen's work. He was associated (In my mind anyway) with a bunch of stuff that I haven't enjoyed about the "new" Disney. So I hope it's a good move for the mouse. Let's not forget, however, that one needs an adequate budget to make any project work. "Ruduction by committee" has been just as much to blame as any one single person. Strip anything of money and you get stuff that is less than it might have been.
MGM is a very nicely designed park, regardless of whether or not you enjoy the attractions. In fact, I just saw the Big hat live, and actually liked it. Wierd, because I expected to hate it.
We need vision and leadership for the future. Hopefully this change helps.