Too “googlish”.
First time Google users may get confused, as there are several buttons with icons familiar only to Google users. Additionally, despite enhanced integration between Google and YouTube, which significantly helps video sharing, support for other popular tools is not built in, and you may find it frustrating that you will need to, for example, convert a simple Word document to a Google Doc to work with. All in all, you will only find yourself comfortable in the Google Classroom environment as long as the tools you are using are aligned with Google services.