Hey, who needs to read anything when you can just react violently to a headline!
5,000 MS Gamer Points per PSN level?
I think Thumbs Up / Down could work, but that depends on how much you trust the reviewer. If someone shares similar tastes with you for horror movies and they say 'You should watch it!', that recommendation is enough without a numbered score.
But that only works if you're intimate with that personality and tastes, which could take years to curate.
I like the idea of a Roger Ebert style "Thumbs Up / Thumbs Down", but that'd really only work for strong personalities.
Other things you could review - How badly spelled is the press release that is sent with it.
F2P Chibi Fallout.