I get why people feel that way, but I feel like it was all for a reason and will be a payoff.
For one you gotta consider the limitations they had with Hulk's storyline due to movie rights and the fact that they had no faith in a solo outing. Now that they're moving Hulk-verse content to TV format, I think "Professor Hulk" is going to take a real dark turn and we'll get something that resembles the old school show. He can't suppress his anger forever and you KNOW he's going to be in the lab trying to fix that arm by hook or by crook...