What makes a good review? Almost every criteria you could either impose or suggest is mostly subjective rather than objective: some are completely arbitrary.

Gamers don't all fit neatly into pre-supposed stereotypical "boxes". Gamers are individuals, as such each person looks for different types of content within a review. Some gamers simply want a quick "down-and-dirty" about gameplay. Others are "meat & potatoes" gamers: whether a game is coded with GPU-specific graphics or if a certain brand of sound card is supported over another. Still others want to know how a game compares to other favorites in a particular genre.

Five paragraphs of 5-7 sentences each is rather arbitrary, as that just boils down to personal preferences, likes and dislikes. If you don't have 5-7 sentences to describe a paragraphed subject, then trying to write more sentences than you originally meant to say will likely ruin an otherwise good review.

In reference to review content, I estimate that most gamers are concerned with (in no particular order) are spelling, punctuation, good grammar, and how much they gleaned from reading said review. One gamer may not agree with a reviewer's take on a game, but they do at least want one that is readable versus atrociously painful to look at.

In conclusion, you'll enjoy writing a review more if you write it from your viewpoint and say what you want to say in as many words as you meant to say them in. Make it presentable enough so no one will develop a headache once they are finished reading it, but write it in your own style.