I thought he came across really well, but I didn't watch every episode. He seems to have a lot of determination, as do I guess a lot of professional sports people. He seems like an achiever and he seems positive, so I imagine if he wants to do something he will do it.
Personally I have no idea if he can act. But he seems quite natural being interviewed and I can imagine him getting more TV work and I don't see why he can't/shouldn't. Like any job, some people are naturally brilliant, others are woeful even after training/qualifications/experience. I wouldn't say you can jump straight in to plumbing though!
I'm sure it's a lot easier these days to cross over between celebrity trades - sports stars becoming actors, actors becoming singers, models becoming presenters, etc. I guess it's a much bigger, more universal world of 'fame'.