Yeah, I still think A.B. was worth putting on the disc -- at least if not that then released as part of the vault instead. The performance is lacking at times yes, but I still think the track overall is good enough to merit a spot.
I don't think it's boredom as much as it is a lack of confidence since he really doesn't know the song yet. I think a more subdued delivery sorta fits the song anyway, but I agree it could be better.