Hi Tim,
Hmm your post starts out about one thing and then goes into another so I will do my best to address matters where I can.
The Simple Commerce Module in EE is really all that, quite simple 😉 It can be pushed to do quite a bit more if you need it to by creative thinking and some liberal use of plugins that you can create yourself but it will never really be a full blown commerce suite.
As to reviewing products then the reviews could be handled quite easily with either custom fields or the commenting system depending on who exactly is writing the reviews - your customers or yourself.
As to rating products then there is a very good module available from Solspace called Rating 😉
There are a couple more ways of doing ratings including a couple of modules linked to on these forums and a quick search should enable you to find them easily enough.
I would just warn again though that the Simple Commerce Module really is all that, quite simple and if you are looking for a full blown e-commerce system then you are probably better off going with something like Magento or one of the other commerce products out there as at the moment trying to get the full set of features needed for e-commerce within EE would take a lot of customisation.
Hope some of that helps?
Best wishes,
Mark