I didn't see BB1 so I am at a disadvatage at judging the three series. Out of BB2 and BB3 then I would say BB2 to be the best. "Because of the Paul and Helen romance"
Question: What would you have thought about BB2 if there had been no romance between P & H!!!!!! "pretty dull" I suspect. So i think CH4 struck lucky last year. The viewers reaped the reward of that luck.