A weakness has been allowing frustration at failure to overcome him – two years ago he hurled abuse at Jonny Wilkinson after Toulon scored a try that confirmed they would win the European Cup final – but O'Gara rates him as the most improved player in Britain this year.
Starved of the strike and subdued by spinner Nathan Lyon, Pietersen allowed frustration to affect his shot selection and was caught at cover via a leading edge to once again open the door to Australia.
I lost sight of many things and for a few months allowed frustration, a general want for "more" and a fear of failure to control my decision making.
Allowing frustration to guide your tone might sour the stylist on you, and you don't want someone who's upset with you cutting your hair.
The assumption every year has been that Manager Lou Piniella would eventually allow his frustration to dictate the way he used his bullpen, and he either burned out relievers he trusted or cast aside relievers he didn't like.
If he has a fault, it is a tendency to allow his frustrations to spill over - a typically fiery send-off he dished out to New Zealand batsman Ross Taylor in Dunedin was described as "totally unnecessary" by BBC cricket correspondent Jonathan Agnew.
Trapattoni allowed his frustration to show.
Hughes, a veteran shooting guard who has been benched since Jan .1, allowed his frustration to bubble up Saturday when these same teams played in Detroit.
If you are yelling at him, criticising him, allowing your frustration to be vented at him, that is simply being abusive, and there is no excuse.
Francis Maude allowed his frustration to show for an instant when he said: "The Conservative party will always suffer if it is seen as trying to turn the clock back to an imagined golden era".
