since I got my eyes opened by several scandals like gamergate (if you dont know what Im talking about and you are a genuine gamer who cares about gaming quality and values reviews and previews in his community you should def. google it and check it out) I have close to zero respect for mainstream gaming journalism.
I get my information from reputable independent youtubers and bloggers mostly, favorite among them Total Biscuit in youtube.
as to the scale being varied, I also believe that people should be given leeway, because the 1-10 scale is mostly arbitrary in what is actually being evaluated, and while like a poster suggested personal fun is a factor in the scale, I think it is actually a counter-factor for the scale and something actual objective critics try to avoid in their reviews (even if impossible to be completely unbiased by personal tastes and perceptions ofc)
but some people give lets say 1-5 points to gameplay alone, and the remaining 5 distributed to factors like story, animations music, aesthetics, effects, controls etc, while others give much less weight to gameplay and more to others, for example while some games have good or even rich gameplay, bioware usually atracts the more story oriented crowd, so you will see alot of 9+ reviews to games like mass effect that really dont have much in terms of gameplay in their favour, but do have alot on other aspects, while you will get 9+ scores to games like Skyrim who have alot in gameplay but much less in the other aspects.
personally I trust reviews that vary 3 points or even more to the "average" than I do reviews that just "follow the hype crowd".
the actual review article where things are explained or compared to other games, is where I pass judgment on if a review is good or bad, the score is just a guideline to how good or bad the reviewer considered the game based on his perspective of what makes a good game (and that is what usually varies the most, or is supposed to)