YANBU - I caught it on the evening highlights show and thought it was fabulous, and cried when they pulled her mum and dad out of the crowd and they told her she had never disappointed them!
Totally mad and exuberant, yes; but I've heard similar rowing / rugby commentary when prizes are at stake. OK they shouldn't have cheered others falling / messing up landings, but this happens when other teams fail to score a try / miss a conversion etc (I often watch Ireland rugby on the BBC for the overall quality of the discourse during the match and this is interesting when we play England!). I for one will be tuning in more, not less, to these Olympics for the entertainment value 