@Nicky...

That has nothing to do with it.... It's probably because despite being out less time than hers, his has already been certified platinum (ie shipped 1 mil units) and as far as I have seen, the same cannot be said for Rihanna's (feel free to correct me if I have made an oversight)... and his also debuted at #1 which Rihanna's didn't. (This is of course in addition to Sam and Trent having a bias against Rihanna. If it makes you feel better, they've had unflattering comments for his album as well. Just proves to me that they aren't really music 'journalists' or bloggers but more like your average listener who only likes what the billboard charts tells them to lol).