Or how about The Shield? They were messing with him for months, costing him championship match after championship match and even defeated him on three separate occasions. But did we once get to know how all these constant frustrations were affecting him? Not really. He just picked up the wagon and kept moving forward.
Can you honestly tell me that any of that defined a solid character in any way, shape or form?
Now take a look at his promo. This is open to interpretation, especially when analyzing the content, but for me, this did wonder for Ryback's character. We finally get to see what he truly wants. He wants to be number one. He wants to be champion. But the only problem with that is, according to what his promo tells us, there's only one problem with that dream and his name is John Cena. It doesn't even help when it's Cena who not only defeated him at the Royal Rumble to go onto Wrestlemania, leave him high and dry against The Shield at Elimination Chamber but in a unfortunate twist of fate, Ryback couldn't even get his own moment at Wrestlemania to shine while Cena was bathed in admiration, victory and of course, championship gold, the championship gold that's evaded his grasp time after time after time. He didn't blow off steam about his anger after just ONE loss. These are multiple losses we're talking about. And granted, they weren't even real losses. Just him getting screwed over and over and over again.
Plus, I believe it's most plausible to expect that action against what a person sees as injustice be taken into the hands of someone with power. Someone who can make a quick easy fix to their problems. With Ryback, he took matters into his own hands by taking out John Cena and sending a message to him in the process.
So in all, although what Ryback was saying kinda sounded like bitching and moaning, I thought it was more of a sadistic interpretation of what he saw as reality which, IMO, makes him a bit more interesting. He made Cena bear the cross of his dilemmas. He's making Cena the focal point of his despair and humiliation. He wants Cena hurt, his head on a platter and the WWE Championship all to himself. And once the history behind his past coincides with that promo he pulled off, I think that instead of a "whiny heel", we instead have a raging monster bent on revenge. Not exactly original but definitely not hindering.