When it was released back in the days it was innovative and pretty much the only approach for back-end developers write front-end code, but after single page application revolution the complexity and speed of this framework looks like a joke.
What do you dislike?
It's slow, require browser extension for debugging. Big learning curve. Google shut down the project at 2017 so no more support from their side, only community updates.
Recommendations to others considering the product
Would not recommend to anyone who stars new project in 2018. Google closed the project at 2017 and only the power of community keeps it alive. Nevertheless if you have legacy code to support it's not that bad. It has everything needed to have a good single page app that still could compete with a whales like Angular or React.
What business problems are you solving with the product? What benefits have you realized?
Single page application architecture. Strict types. Java syntax and support of huge java ecosystem. Ability to write java script inside Java.
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