Bitcoin consumes 4,000,000,000 W of power to process four transactions per second. A single Raspberry Pi with a database can do an order of magnitude more on 5W. Think about that next time you wonder if it's a good design.
I understand the problems Bitcoin solves. That doesn't mean it isn't fatally flawed in other ways. I also know other designs might fix these problems. I'm talking about Bitcoin, not cryptocurrencies as a whole.