I believe giving only high ratings has nothing to do with weight of the vote. Someone may really care only about awesome runs and rate them only. But have a good eye on everything. I mean, he doesn't want to give low rates to the movie he can't watch.
Also, about author's rates. The author not just remembers how he tased the game, but he knows the things that average viewer can miss during watching. The author knows all these, but other people may need to watch it several times in a row to notice. So, he really may give a reasonable entertainment rating.
What we reay need to do I think is improving our voting guidelines, reminding the important factors that help to give objective rates. See
my page.
And as for players voters, I think the higher the score, the more weight the rate shall have. And at some point it shall overcome 1. Probably after 1000. And players with score around 100 definitely not have such a trained eye.
PS: The rating shall not ever depend on mood, only on real feeling about the amount of the work and on the resulting impression. And if someone votes by mood only, we shall work out a method to minimize that abuse. That;s why we shall set different weight for differently scored players.