I see so many people dissing the technology and rehashing old arguments.
You shouldn't consider Bitcoin as a currency but as a better form of Gold. Like gold it has a limited amount available: ~180k tons of gold and eventually 21 million bitcoins. Like gold it is a good store of value (especially as more people are dropping their gold to purchase BTC). Unlike Gold you can send it to someone else online and that means it can also be used like a currency (even thought it is not its strength).