So in this innovative learning experiment, your Professor assigns a class blog. A classmate, Lisa asks is this the best way? Excellent question. What are your other options? Possibly wordpress.com, ning.com, kickapps.com. Of course, that means people need to explore the sites to figure out which one will be the most efficient, user-friendly and get the job done. And, there are probably thousands of other sites to consider.
Note, I chose Blogger because it was easiest enough for me to learn. However, I have students with blogs on wordpress, the Practicum Pioneers and Belmont Media Blog.