I am one of those who did not agree with the Hulkbuster fight, though I do realize he was groggy from coming out if the mind control. Like I wrote in an earlier post, yes, the Hulk was losing when the Grandmaster interrupted. But losing does not equal having lost. Like most of their fights, this fight was a back and forth affair.
You are right mostly back and forth because Thor chooses not to fight. I believe the Hulk was enraged coming into arena like you believe he was groggy in Hulkbuster fight. I cannot see how that would make Hulk less dangerous, I do not believe even if Hulk was impaired the Hulkbuster suit would prevail. I think it goes back to the movies are different than the books. That being said Hulk does not and will not match up well with Thor or any of the warriors to come on their power level in a gladitorial setting. I think in end it is all fun.