A few quick suggestions, apologies if they've been mentioned before.
- Played/rated indicators.
- Symbol/outline/something shown on the "game preview" when searching.
- Banner on game page (like the 'Owned' one), perhaps with a reminder to rate/review if you haven't already done so.
- Owned indicator on "game preview".
- Option to show reviews in collection instead of adding blurbs, as in most cases their content would be the same.
- Collection discover-ability:
- Page to search for collections. I'm aware a few get shown in browse side bar, but I'd rather a more reliable means to find them. Instead of using the most common tags in collection as reference, perhaps allow tags to be added to collection to improve their search-ability.
- On game page, button to see public collections it's in, similar to the 'Relate Games' page.
- Make certain key information from the 'More Information' section displayed prominently elsewhere (Last Updated, Average Rating etc). Or at least user option to have 'More Information' section expanded by default.
- Improved search (Seems these may be possible by manipulating URL, but they really need to be in the page ui)
- Exclude tag from search.
- Search with tags & keywords at the same time.
- Don't increment a posts edit count if it's within 60~ seconds of post.