How I Use It
I created a Google Site as my class website this year. I store class content such as links and documents on our site. I teach four different courses, so I made subpages for each course. My students use the site as a resource.
My site looks very clean and my materials are very organized. I prefer this over Google Classroom as I don't need a constant feed, and I don't really need something for Google Docs, Forms, etc. submissions. I simply needed somewhere to store class information such as useful links, class codes for different websites we use, etc.
Sites could be easier to use. It took some time to play around with everything to get it to appear the way I wanted. I've used Weebly (not for school) before, and it was much easier, but I really want to transition to Google as much as possible for a variety of reasons. I also found Blackboard to be easier when I used it in the past, but was not interested in using it for reasons such as cost, interface, etc.
If you are looking for a basic website, Google Sites can be great, just be prepared to take some time to learn about its features. I initially entertained the idea of using Sites to create digital student portfolios, but I cannot imagine having my students use this. They would get frustrated very quickly, I think, and while I encourage them to persevere, I think they'd become so frustrated with this that it would prove to be a barrier to learning.