Kane can still work the stick. The problem lies where he's associated.
When Kane is allowed to be a loner and say whatever the f*** he wants, its always articulate and well said.
Right now, he's helping to put over Reigns, just like he did with Bryan, Punk and Randy Orton.
Putting over people often means you tone down your mic work accordingly.
Kane's best wrestling days are passed him, but if he had free reign to speak, in a lesser feud, his mic work would make him passable.