As far as each generation is concerned it is very predictable because there is a certain standard that was placed on that generation.
Elegant navigation and supports user task
When it comes to navigating through this huge site there are few minor problems. As with any large site, getting from route A to route f could be a slow task. However, the options that are standard in each page make the journey easier. For example if I were going through pages of someones report in generation 2 and I didn't know how to get back to their homepage then I would simply scroll to the top and click on their homepage link which is standard in every student page.
As far as supporting the users' task there really aren't any criticisms because I found no problems in using this site for a variety of different jobs.