Recs.
Updated
SpecsUpdate
Pros
Pro Huge community
The Phaser forum is huge: http://www.html5gamedevs.com/forum/14-phaser-2/
Other community places are the github repo: https://github.com/photonstorm/phaser
and Twitter: https://twitter.com/phaser_
Pro Sandboxed editor for demo
The Phaser 2 Sandbox allows you to code games in your browser without having to download or install anything.
The powerful editor features Phaser code assists, JavaScript snippets and lots of the features you've come to love in editors like Sublime and Brackets.
Once finished you can save, export or share your game.
Cons
Con Breaking changes within versions
When Phaser v3 came out, it was completely and 100% incompatible to Phaser v2. The FAQ suggested you write your game again. Phaser 2 is maintained but not directly by its creator: Phaser-Community Edition (former Phaser 2) is maintained by its community and released on demand.