I can’t speak for their personal feelings, but a big part of what made the show work was the chemistry on set between the aforementioned 3 tittering schoolboys.
Yes, it was immature and ridiculous. But that was a big part of the appeal, the camaraderie of 3 guys hanging out and giving each other shit. It was a caricature of male bonding, with British wit added.
That chemistry between the three is also why all the international clones haven’t been any good, at least the ones I’ve seen (USA, Australia).