I had used it before, the first version before Google bought them, when I was looking at AngularJS. It is mostly used for JavaScript based SPA built using frameworks such as Angular, Ember and Meteor. However it can be used with other frameworks such as Rails and Laravel via DB wrappers. For what it is, it works well considering that it takes care of background tasks such as CRUD and Auth for you.
With all that said, it comes with the caveat that its a Google acquired business, so longevity of the platform should be considered.
1.8 Ghz Pentium 4 (OC'd.) / Intel P4 (478) Motherboard / 800MHz DDR / 256 Mb DDR RAM / 40GB Seagate / RIVA TNT2 Pro 32MB / 24X12X24 Sony CDRW+ / 18" View Sonic CRT / Windows ME Yes it will play Doom... i plan on trying Crysis 3 one of these days.