Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Waste of money!

My twin sons love Spiderman so I bought this building set for them at Christmas time. What a disaster! The "nubs" for the blocks are too short and the pieces won't stay together. Every time the boys touch the buildings, they crumble. It's not just children who can bring them tumbling down. I can't keep the pieces together when I'm using them either - and I'm an architect. It's very frustrating for everyone. Did anyone bother to try out this toy before they put it on the market?