Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A complete waste of [...]

My 3 year old son saw this toy on a tv commercial and said "I wish I could have that" so Santa delivered the toy on Christmas Eve. I didn't have trouble putting it together at all. However, when he went to play with it, the cars hardly ever made it through the whole track. Tow Mater was far too heavy to even get started. It is extremely loud and the track keeps coming apart. I was trying to decide whether to buy this or the Diego Rescue Center and sadly I picked this toy instead. My son tried to play with it several times but became disinterested when it didn't work. I went out yesterday and purchased the Diego toy which works wonderfully and is well worth the [...]. I will be throwing the Mountain Challenge track away, but not before I write a letter to Matel to tell them what a faulty product this is.