MC doesn't have a stock [Review] field, so I assume you mean you previously added such a tag to the files using other software, and now that tag is not being displayed in MC. Generally, MC will import data from file tags to fields with exactly the same name. So try adding a [Review] field using Options > Library & Folders > Manage Library Fields... Since they're album reviews, you'll probably want to set Relational to 'Store one value for each album'. After adding the field, you may need to use Library Tools > Update Library (from tags) to add the data to the Library.