It's kind of funny that I don't really recall some of these incremental changes to is look over the years. Kane certainly did solid work, even on the mic, during his unmasked days. That being said I was a much bigger fan of the mute, masked monster.
Honestly, Kane's continued success is quite remarkable. WWE's ability to keep him fresh over the years and his ability to avoid injury, etc. has given him a much longer career than I anticipated when he debuted in the 90's.
It will be interesting to see what the endgame is for the return of Corporate Kane all I know is that much like Alberto del Rio he is an underappreciated part of WWE's product.