Olly isn't a TV presenter. I can only assume that on Xtra Factor when he was on there, they didn't have autocue and a lot of the stuff they presented to camera was rehearsed.
Olly is awful, he messes up so many lines and he over pronounces EVERYTHING and don't even get me started with the constant hand gestures. Useless. I really like Caroline though.
He was fine on xtra factor when it was a bit more casual and for fun. On the main show he's just not up to scratch though. He needs to be a lot more professional than he is and it's just not happening.
He really is bad, like really bad, worse than kids tv bad. He has a problem stringing together sentences without the autocue and when he does have the autocue you can see him focusing very hard and struggling to read it out.
I think he's fine, but he seems to be changing his voice to a far more serious tone than he has in interviews. People liked them on Xtra Factor because they were fun. Embrace that, don't try to be more serious.