Thank you for the honest feedback! The default UI for the desktop WebViewer was created a few years ago and it is showing its age. The UI is provided as something to get you started and we expect that most WebViewer users will want to customize it to match their brand and improve the look and functionality.
The WebViewer allows you to heavily customize the user interface and user experience but obviously for more complicated customizations it may take more time.
We've been mainly concentrating on the core technology side of things to make sure that the documents are faithfully reproduced, rending performance is high and that our customers have all flexibility and power to implement whatever they need.
With that said, it seems that WebViewer SDK comes across to many users as a 'Ferrari engine in a 3-year-old beige Corolla body'… so we would like to change that image and improve the default reader in WebViewer.
At the same time it is important to keep in mind that almost every WebViewer would like to use in a different way. Some WebViewer users need flipbook experience, others need scrolling. Even when it comes to flipbook there is so many different and conflicting requirements that it is unlikely we will ever be able to meet all of them. And for many of our users this is a matter of competitive advantage (i.e. they use user experience as a differentiator for other WebViewer implementations).
Btw. we are about to release WebViewer 1.8 and one of improvements will be a bit nicer looking default viewer. Here is a sample link shared via Xodo (a free app that uses WebViewer for real time online collaboration on PDF):
http://xodo.com/view/#/collab/242ab2c3-ae52-4eaa-892a-a46f1ae6c8e7
Thanks for the reply.