I think the problem with the Fairy one was there was a spate of Fairy ads amongst the bloggers, which is one of the things I loathe (although I agree now you've said, it was good message, and it's a shame it might have got lost). Because there were so many, I rolled my eyes and scrolled past without even reading it.
When the brands send out the same 'gifts' and all the bloggers start showing it, regardless of whether it fits their normal content or not, it makes the brand look they're not discerning and like they're just chucking money at bloggers in the hope that they've covered all bases (which says more about the brands tbh). It's also becomes a bit boring for the audience, perhaps seeing the same item over and over.
The one that really stuck out for me (and I don't think you advertised this @Badmotherpukka), was the babysitting ap. I really didn't buy that from any of the bloggers that featured it.