Really, AC should be good at the whole presenting thing- he's done live shows for a long time. He doesn't really take himself too seriously, and is very aware he was not the best tennis player ever.
It's just a shame he's a bit hopeless at the thing he's meant to be doing -i.e talking about tennis, and when he's with people who do know their stuff, it really shows.
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it's a bit like Claire really. I don't mind Claire s much as some - she's a safe pair of hands presenting live events- she was fine doing the Olympics, and TAW, in previous years. I'm not sure she's suited to the 'main' Wimbledon gig.