Navigation in D2L is mostly easy and that is what I like about it. My institution's D2L is setup so you can easily see all "my courses" once you go past the single sign-on page. You're able to see notifications, important dates including events scheduled in a calendar, which makes it easier to see a lot of things just at a glance. And once you're in a specific course, you can navigate and access checklists, grade-book, quizzes, class-lists, course content and so forth within few minutes. All these make it easier to use D2L and I like it.
I dislike a couple of things about using D2L;
Firstly, grading quizzes using rubric never worked for me until very recently. Even though it now possible to grade using rubrics, there are still technical difficulties. For instance, grading from either "Spreadsheet" or "Standard" Views do not seem to be the same. Regardless, of the "view", when you grade with rubrics, you still have to manually input the grades into the spaces provided for grades (in other words grades do not get imported from the rubrics) and that is frustrating and time wasting.
Moreover, it is very difficult to find all the discussion posts (threads and replies) of a particular student without having to go into the "Edit Course" and following other procedures.
Finally, when importing for instance a test-bank into D2L, some characters tend to be configured differently, like a simple multiplication signs, arrows and so forth. I hope these issues can be addressed.
It saves time to give quizzes and auto grade them, allow effective communications such as instructor-learner as well as learner-learner interactions etc using an online learning management system that replicates face-to-face classes....without having to spend too much money and I believe that is why D2L comes in. And to some extent, D2L has been helpful in those categories.