Osman has been a wonderful host, sympathetic to the guests - even managed to be civil to the few that are obnoxious and/or supremely thick.
Sheen will probably settle into it as he does more shows, his first one seemed to have him talking too much - but he must have been nervous. I like the "Where is Kazakhstan" round (place Geography answers on a map) as it really shows up how lousy many people are with that subject. A recent edition had 3 questions about US States (the map outline they had to work with), One answer involved finding Dallas on that map -- a couple said "oh, I know it's Texas, but WHERE is Texas" . . . . . .
Quiz hosts must get used to hearing really silly answers -- I recall a Tipping Point when a contestant was asked which Tory leader had the initials 'IDS'? He said, "Oh, politics isn't my strong point" (he'd already shown that ANY 'strong point' would be a surprise), and when pushed for an answer suggested "Margaret Thatcher". Ben Shephard looked like he almost wet himself, but recovered well to be reasonably polite to the poor chap.