I like that it is easy for developers of all skill levels who are not familiar with servo web development in general to get up and running quickly.
The documentation could be better organized; there's some redundancy between sections or subtopics within each section making certain topics harder to find than others. It would also help if there were more examples available through tutorial videos/docs as well (though this may just come down to personal preference). We've been able to make rapid progress developing an application using Servoy without having any prior experience working at the low level details of HTML5 WebSockets API.