As I've said elsewhere and the problem will get worse next year if nothing changes, is the so called "celebrities" aren't as interesting this year.
Of those who participated, I knew of Martina Hingis, Richard Dunwoody, Jade Johnson, Joe Calzahgi and Phil Tufnell, because of their sporting association. Of the rest I only knew Linda Bellingham, probabably because I don't watch any kind of soap, morning magazine type programmes or programmes like Crimewatch.
Anyone with a real "high profile" won't be interested in tying themselves up for sixteen weeks on the money the BBC offer them and more importantly won't be too keen on putting in the level of training required to be successful.
So stopping short of saying they're all boring (though some are), with a series as long as it is now there's bound to be a lot of repetition and with so many people in it everything each of them say is likely to be repeated by themselves and someone else at some time.