I don't know if that's relevant, but GG bestselling title is Civilization 5 now, and it has 1000 votes/ratings http://www.gamersgate.com/DD-CIV5/sid-meiers-civilization-v
and second best-selling title, Football Manager 2012, has 200 votes.
For example, The Withech 2 has over 6000 ratings, Planescape over 7000 ratings, and Legend of Grimrock 1329. But you don't have to buy a game on GOG to rate it, so...
All that means is that GamersGate took money from thousands of people and then sent them over to Steam to pick up their order.
Ratings mean nothing. You have to buy a game on GG to rate it, and a lot of people won't even bother doing that. On GOG, anyone can rate games.
GamersGate is a much bigger site. GOG is very small. With only 400 games, that's not a lot of product. Plus, a lot of people who frequent the forums might spend a lot of time on GOG, but they don't spend a lot of money unfortunately. I mean, come on, some people are complaining about a $5.99 price tag, so how much are they realistically spending on GOG? Not much, obviously.
The price tag on many games on GG, on the other hand, is upwards of 40 bucks, and they're top selling games that people are actually looking for. Few gamers, compared to the massive hundreds of millions of gamers worldwide, are looking for Gabriel Knight 2 or Broken Sword. But they are looking for Civ 5 or Crusader Kings 2.