It's a review - he's supposed to give his opinion through his experience with the game... Isn't he?
He's a professional; he's supposed to write a review that isn't just him babbling about his preferences but giving an analysis of the game and THEN his opinion on it. At the very least, he shouldn't lie, he shouldn't spread misinformation, he should be expected to be an experienced gamer that understands mechanics and so on. Reading his review feels like reading a review of a dude trashing Ran because he thinks it's a rip-off of King Lear.
In short, yes, he's supposed to give his opinion, but the quality of his opinion should be of some worth. There's an army of teenagers on GameFaqs more articulate than him and apparently possessing a deeper understanding of videogames.
I'll try to give you an example: I never finished Fallout 3. I hated it. It felt generic, bland, slow, empty, boring and generally terrible to me. One of the worst gaming experience I had in the last few years. As a consequence, I didn't finish it, I didn't bother learning the mechanics and so on.
Would you trust me to review the game? Sure, I have an opinion of the game, but is it an interesting one? A full-fledged one? Do I have anything more interesting than "this game didn't really click with me" to share on the topic?
Pretty much sums up Sterling's review, only that instead of refusing to review the game and letting someone who wanted to give it some attention do it, he went for his usual "let me rave about a game I didn't really bother playing" rant. Unprofessional to say the least - if you want to review a game on a professional site, you should dedicate enough attention to it to understand its mechanics (unless he's actually that stupid or can't read, but I doubt it).
On FFXIII, I bloody hated most of what it did to the franchise. If this is how FF will be in the future, it's as good as dead. As a fan, I consider it the biggest enemy FF has right now.
I can't think of rating it anything less than a 7. Because there's such thing as
objectiveness, and while FFXIII isn't what
I want, it's undeniable that for someone approaching the game without bias the game has a lot to offer. The production values are through the roof, the amount of content is huge, the combat system is genuinely well thought of, the writing is above the industry's average, the story is above average and so on. It's not what I would have wanted, it's not what FF is (in my opinion) supposed to be about but I cannot label it as a bad game, or else I would have to rate 99% of the current gaming production below 5. I simply didn't like it (for reasons I consider excellent) and I'm mature enough to understand it doesn't mean the game is a "4", and if Sterling had some understanding of what reviewing a product means, he would know it too.