Many experienced developers use web2py and find it to be quite flexible and powerful. For example, see comments here (http://harrywolff.com/2011/01/web-application-development-fr...) regarding questions about function re-use and form customization. In web2py, I don't think the complicated stuff is generally any harder than it would be in other frameworks, yet many things are often much easier. Granted, though, sometimes documentation is lacking for some of the more complex stuff. A recipes book is due out soon, so hopefully that will help.