This is just another example of the "there is only one way to do things, my way" philosophy that taints so many discussions about software development.

Sure, GWT does not create the cleanest mark-up and javascript in the world but maybe that is not always your goal. You may just want to get a web app up and running quickly but are lacking the javascript expertise - cue GWT, which allows you to harness your java expertise to create a web app.

If you don't like to create web apps this way (I for one would much prefer to hand code javascript), then don't but also don't go around name-calling the technology "disgraceful" just because it does not serve your own specific purposes.