I like that it's open-source, which means anyone can contribute to its development in order to improve upon what is already there or add new features! It also has an active community with many developers who help out when needed but are not paid by Core Developers as some other projects do (e.g., Ethereum).
The documentation could be more extensive so people don't have problems getting started right away; however this will change over time because they want their software used widely around different industries/markets. We're using tendermint at work primarily within our supply chain management system where we track items throughout various stages from production through shipping into consumers' hands - all via blockchains.