In some ways I agree with you, Rand, at least about

"Some games take a lot of effort to find and cost a lot of money, so it would be useful to know if it's worth the trouble or not"

The way to deal with this, though, is not for the reviewer to put as many opinions in his or her review as possible, but for the reader to try to get a lot of opinions on a game - or at least opinions the reader values highly. Chances are you can find people who will like or dislike any game; seek those out, and see who makes a more persuasive argument.