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A real critic should be objective, yes. And at the same time tell you what can be done better (e.g. draw comparisons to similar things - that way you get away without statements like "this is too hard/easy/loud/green").
A subjective review is just an opinion. Sure, it can be well written and based on proper arguments but it remains an opinion that anybody has and you will have to like/identify with the author to get an idea of what they mean.
Everybody has an opinion and can spread "reviews" but it's not critical. People tend to forget that (both authors of "reviews" and their audience) and feel like they can change the world or personally attacked.
Just like the most famous games/music/movies/... don't equal the best, neither objectively nor (and definitely not) subjectively.