Frankly, there's nothing wrong with Bitcoin. No, I'm not talking about the economy that's sprung up around Bitcoin, I'm talking about Bitcoin itself.
Can anyone tell me what's wrong with Bitcoin?
Hmm, it doesn't scale at all. Mining is flawed because it favors pooled mining (not really good for the decentralized part of the network). Also, the code of the client is pretty horrible as well. Also, the wallet.dat is stored unencrypted on the disk. Finally, we lack a wallet protocol and per-address signing.
(Edit: never mind. I should have realized you were trolling, as usual.)