Package descriptions are empty excessively often. Class descriptions are empty excessively often. Method descriptions are empty excessively often. Field descriptions are empty excessively often. Basically, where there should be human-written words conveying the intended meaning/use/functionality/etc. behind an item (package, class, method, field, etc?), there is almost always no such words.
Compare the level of detail provided by SmartBear for one of SoapUI's core classes:
https://www.soapui.org/apidocs/com/eviware/soapui/impl/wsdl/testcase/WsdlTestCase.html
with the detail provided for this core class from MongoDB API:
https://api.mongodb.com/java/current/com/mongodb/DBCursor.html
The difference is incredible. On top of being super helpful, the detailed, thoughtful commentary in the MongoDB API documentation generates the feeling that the developers and maintainers of MongoDB care about their users. I get quite the opposite feeling when it comes to SoapUI. That is what I want to convey. More or less.