I've been to some really bad ones with my 5 over the years.
The ones in the homes that were bad was because there was no food for adults and the party was on for 4 hours. Another just did healthy food for the kids and they were all looking for the sweets and crying. Another was we all had to take off our shoes and sit on bed sheets on the furniture. Another had bought in all these fancy cupcakes that were built up to make a birthday cake, all these fancy glass jars full of retro sweets and chocolate , I could smell cooked food, they had the room decorated all fancy with balloons and shit, we were allowed to take photos in this room but we had to have the party in the garden, we didn't get any of the fancy food, we were told it was only for family later on, we were offered a plate of sandwiches with awful fillings.
Play centres, I don't think there was one decent one. Kids always seem to enjoy them but I always ended up minding the kids of the parents who managed to escape.
Trampoline centres, dear god, I bless myself passing these. When I was told I had to jump with my child I could feel the sweat pouring down my back. There is not a hope in hell I can jump without wetting myself. Even trying to walk on them is impossible. I don't know what I expected from this type of party but I never went again.
Any party that involves parents to be all singing all dancing made me roll my eyes right back into my head and set myself on fire.