I use anursery myself for DS (3 yrs) and he's been going since he was 4 months. It's hard to know if you've made the right decision because at the end of the day, you know no one will do as good a job of it as yourself or if you're really lucky, your mother!
The flip side to using a nursery is either a childminder or a nanny, I discounted both options because I felt I didn't want to leave my child with just one carer who would have a long exhausting day with one or more children (in childminder's case) and there wouldn't be a fresh pair of hands to takeover.
The nursery DS is in has the staff coming in on shifts - some do the early shift and some do the later shift. I liked this because it meant the staff coming in on the later shift were fresher and not as tired or irritable.
While the BBC was able to take a hidden camera into a nursery environment, what happens at the childminders? What secret cameras are in there? Ditto with a nanny (unless you were installing secret cameras in your own home to monitor what was going on!
I'm resigned to parenting by guilt at this stage - it's a side effect of motherhood! Just do what's best and most comfortable for yourself and as long as you can live with it, it shouldn't matter what anyone else is saying.