It's not the first time that some guests offended a member for his review (this is not your case), it's not easy
I agree with you when you said who starts to make a review is often a lover of that game, but you know it's hard to write a good review and it's hard to find people....we are talking about old games that probably are still played by the 0.0001% of world gamers (or less).
About the ratings, in the past I've suggested to change the system to 1-10 instead of 1 to 5, but this is another speech.