Hands up, I've only been to one (today). My DD is 2 and we've only moved to the area/been going to the nursery for a few months, so although I was a bit anxious going as I literally know none of the kids or parents, I thought it would be a great opportunity to get to know some!
The soft play itself was mobbed (as expected on a rainy weekend), but it was also laid out so the play areas were all round all sides and seating in the middle. The party had 2 couches to one side, where grandparents sat and everyone else dumped jackets/shoes etc. All kids from same group at nursery so all 2-3.
Kids weren't really able to play with their group as they were so spread out and so many others there. I made small talk with a few parents, but most of them weren't with the party. I had no idea who was or wasn't!
Then there was an announcement to go to a party room. We all crammed in. Not enough seats for parents and kids. I tried to leave DD to it as much as possible and stand at the back with the other parents, but although she can talk she wouldn't be able to tell the girl her name or what meal she ordered etc. so ended up crouching next to her for a bit.
Then back out to play. Then called back for a special visit from a character and everyone to sing happy birthday. No cake so then back out to play. Then at the end time we went to put shoes on/get a party bag and say goodbye.
Maybe they were all just too young, but surely this isn't much of a party or much different to just going to softplay normally?!
I just think an old school style hall of some sort, with a bouncy castle and buffet would have been much better all round (and much cheaper!). Am I missing something??