So you're asking if, let's take Sonic's Ultimate Genesis Collection for example, you reviewed the things like the artwork and game history they included, without actually reviewing or talking about the games in the collection themselves? Are we on the same page?
In that sense pretty much but also talk about the games included without actually reviewing the games themselves. Mainly talk about the quality of the port into the collection compared to how the original looks or plays and if there are any slight differences and stuff like that if you see what I'm saying.
To shorten it, talk about the collection's features, extras and quality control about the games included in the collection without reviewing the games themselves. AKA review how good or bad the collection is.