That's true, but it works all fine as a currency until it comes to the fees. I've placed some orders on a website and all went very well until the day I found out the fees they took for every transaction was actually more than 5%.
That's a turn-off for me.
Are you talking about network fee (miners) or some fixed fee which was added by the seller? Most of those who accept Bitcoin as a means of payment use intermediaries (payment processors) and extra costs can occur exactly in that part of the payment. Also, if the primary price of the service or product is expressed in fiat (and usually this is case) most payment processors will charge you at premium BTC price, which would mean that paying for the same product or service with BTC is a little more expensive than paying with fiat.
When it comes to network/mining fees, it always depends on the state of the blockchain/number of current transactions in mempool, and as I show in my previous post, it is possible to send hundreds of millions of dollars worth of BTC for only $0.10.