4
Many modules can be used as a reviews module:
+ News
+ WFSections
+ Articles
+ Weblinks (This can be modified slightly to work)
+ Lykos Reviews (Although still not 100% with XOOPS 2.0.*)
+ MyGSReviews (Not fully compatible with XOOPS 2.0.*)
Like I say many modules can used as a reviews module, depends on what you want really.
Hope this is of some help.