It's easy to use, it has good documentation & examples that can be used as templates for new projects or even existing ones! There are many ways of doing things in netty but they all feel like there should have been more thought put into them before being included/implemented by default (e.g., async write()).
Also I think some features could've had better names than what was chosen originally - e.g., "netty" instead of just plain old HTTP server. But these might not actually matter muchβ¦