I personally watched Hellmuth play for several hours one day in real life. I do have to admit he was one of the nicest guys at the table as long as the cameras were not on him. During one of the breaks he came over and was signing autographs and could not have been a nicer guy. Most of the hype is from the media; him playing for hours and them showing the 1 blow up.
I personally would blow up from several things i saw when i was watching him. People were calling his raises and reraising him with complete garbage atleast every 15 minutes or so to just try to set him off.

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Kickboyswoop