In college, we tried using Google Groups for a group project that consisted of multiple documents. Google Docs or Google Slides would have been appropriate, but to share these slides and docs we needed to use something everyone could access. We had issues trying to add people to the group, some people couldn't edit certain things, other's couldn't even see the groups content. Overall, it was kind of just, well, a mess. Google Groups needs some work to appease it's users. If I'm an engineer and couldn't figure it out, I'm sure not everyone in Google's customer base can.