1. It has no intrinsic value.
2. It is hated by those who like controlling others (socialists/post modernists). This might not seem like a flaw, bit since these people control government, it means that its users would be relentlessly prosecuted.
3. It's hard to get into. Because of no. 2 it's hardbto convert local currency to monero 

 4. The price ;) 

 Are you talking about transaction fees? 

 What are the transaction fees of Monero? 

 around $0.01 

 That doesn't sound expensive..