I've been bored of the Undertaker ever since he reverted back to the Deadman gimmick. His initial run as the Deadman was great and could not be repeated, even though he's tried. He needed a gimmick change to freshen him up, but it is boring. As for his returns specifically, yehhh, they are the same old same old, but there's not much more you can do with him. That is his gimmick afterall.
I just hope he has a good run, wins the Title, puts a couple guys over and then retires next year on a good note. He's a solid worker, but his gimmick has gotten stale and he is too injury prone nowadays.