The best for me is that you have not to trust anyone, that you can transfer funds worldwide and that you can join the system without registering anywhere. If you want more opinions, just tell me.
You still need to trust the merchant if you are to buy goods. Trusting no one is just a myth in my opinion. Merchant do not need to trust the buyer but buyers do need to trust the merchant because he is the one sending his bitcoin payment first.
But people should use bitcoin because of the ease of transfer as long as we are paying the right amount of transaction fee. I have my transaction getting its first confirmed in less than 10 min as long as I am paying the right fee.