Is Polkadot reliable?

Could you please enlighten me on the reliability of Polkadot? I've been hearing a lot about it lately, and I'm quite interested in exploring its potential in the cryptocurrency and finance sphere. However, before making any decisions, I want to ensure that it's a trustworthy platform. Could you provide me with some insights into its security measures, scalability, and interoperability? Additionally, how does it compare to other major blockchain networks? Your expertise in this field would be greatly appreciated.