I'm going to be one of the few defending Big Show, but I will not defend his booking. 90% of his WWE career has featured him booked anywhere from embarrassingly to breathtakingly awful. Bright spots like Jerishow or his 2002 to 2003 heel run vs Lesnar (sometimes Angle) are overshadowed by decades of him literally and figuratively being shat on.
He should not be booked so aggressively into the main event. The 2015 Rumble was an embarrassment, but did that reflect on Paul Wight the man or the booking of Big Show the character? Personally, I liked it when Show turned heel at Survivor Series, even though it was turn #370 whatever (seriously, who would ever kayfabe trust him?). It took Cena out of the match and I was excited for him to become a stooge. Then he went to the top of the card, and stayed there, for months. Yawn.
Big Show and Kane should be in those suits accompanying Rollins to the ring, not those retired midgets. Show should return as a stooge to Rollins, but this is the mid-card era no one is allowed to rise to the main event.
Nothing changes the fact that Show is marketable and casuals will always see him as a threat based on his extraordinary size, which allows him to easily slip into main event roles. He was never going to put on five star matches, but giants sell tickets. There's a lot of fan favourites on the roster that can put on those matches, but the public will say, who?
Big Show's booking has straight up stunk. His time in the sun is over, but saying he should just retire when he has a little gas left in the tank is just nonsense. There are so many roles he can be filling, none of them should be main event. Put the giant in a suit and have him align with Rollins, at least then there could be some pay off for a Rollins split with his stooges (the same can't be said for J&J).
There's a whole crop of future guys that need to become stars, and slaying a giant is a great way to do it. Show should be working with the younger guys or serving as a flunky. Demanding his retirement is a symptom of him being in every major angle and him being in the top of the card when he's stale as all hell and in the golden years of his ring career.