Just like you, I also can't believe the ratings on Yahoo Auctions.
Literal
You same-as I [also-も] Yahoo-Auctions [possessive-の] ratings [subject-が] can't-believe.
同様 (similarly/same as) is a formal way to draw a parallel: 'same as you, I also...' ヤフオク is the common abbreviation for ヤフーオークション (Yahoo Auctions). 信じられない is the potential negative: 'can't believe.' The sentence captures shared online-commerce frustration.