I will start.
1. Make all pages in the list 2 column format.
2. Remove the most voted games from the front page and give it its own tab.
3. Sort games Alphabetically, By Genre, Most Voted, etc.
4. Create a Master Database by Publisher of all games they produced.
5. Have the search function clear itself after each use.
I will stop there for now, but I think this may help gog know what users are looking for, but remember be constructive and be nice! :o)