I am very lucky in that we have a really nice and pleasant soft play place near me (as I know alot of them are really horrid). I only go during school hours as my daughter is only 20 months. She is very able to climbs over the whole frame, with me helping her.
Today when we went there was a little boy who must not have been much more than 2 was left by his mother/nanny/ granny whatever just to play on his own. I saw him fall down a big drop and I checked he was OK and he happily played on, a short while later he fell again and was crying, I waited for a short while as dd was climbing up a ladder ahead of me and I couldn't just go running off, no one went to help him, so I went and got him up and he stopped crying. At this point the mother/nanny/granny or whoever she was came and got him and took him home.
This playframe is aimed at over 5s but is easy for little ones as long as they have some assistance and someone ensuring they don't throw themselves off great heights.
I felt so sorry for him and his carer was just sat having coffee and a gossip.