You can use either a wordpress review theme or get one of those review plugins.
Themes:
InReview from Elegant Themes ($39 for all of their themes)
Review Engine Theme from DailyWP ($119)
ReviewsPress (from $20 single site license - $90 unlimited sites)
Pro Review Theme ($37 single site license - $67 unlimited sites)
Plugins:
wpreviewengine ($100 for one site and $170 for unlimited)
WP Review Site ($100 single license and $200 unlimited)
WF Review ($90 single license and $140 unlimited sites)
MyReviewPlugin ($90 single and $130 unlimited sites)
GD Star Rating (free)
Review Rating System ($67)
ReviewAzon (for Amazon products) ($80)
WP-PostRatings (free)
Wp Comparison Charts ($20 single and $40 unlimited)
WP Zon Builder (for Amazon products) ($100)