WhiteChest [Open Recruitment / GA] (The Wolf Among Us, Crawl, Tropico 5, etc..)

But it's definitely possible to get a user's wishlist somehow. This site does it, among others. Maybe ask cg how he implemented it?

Second attempt:

Dungeon of the Endless
Dragon Age Origins
Assassins Creed Brotherhood
Risk of Rain
Spelunky
Dust an Elysian Tail
Wargame Airland Battle
Superhot
Helldivers
Duke Nukem Forever
Shadowrun Returns
Spore Galactic Adventures

This time it's even more popular stuff, and still no good matches.

Third attempt:

Sonic Generations
Botanicula
Legend of Grimrock
Call of Juarez Bound Blood
Orcs Must Die
Brothers
Transformers Fall of Cybertron
Mass Effect
South Park Stick of Truth
Metro Last Light
Sonic Adventure 2
The Orb Chambers

Okay, so we got our first obscure game - The Orb Chambers. Unfortunately it's also a terrible match, as I hate platformers and skill games and I don't much like puzzle or physics games. The problem here seems to be the game's tags, which don't match the store page description at all.

Other than that, all popular stuff and still no good matches.

Fourth attempt:

Redcon
Ironcast
Fin & Jake's Epic Quest
Fieldrunners
Starwhal
Oddworld Munch's Odyssey
Fieldrunners 2
AAaaaAAAaaaaaAaAaaaAAAaaAaa
Lifeless Planet
Beware Planet Earth
12 Labours of Hercules IV
Rush

Now that's interesting. Multiple games with less than 1000 reviews, and 3 I haven't heard of - Redcon, Ironcast and Starwhal. Redcon is also the first good match. The other 2, and the rest of the list, are pretty bad matches.

It seems to me the algorithm could be improved by making it focus on more obscure tags first. For example, Strategy gets slapped on everything from Grand Strategy like Victoria 2 to 4X like Stellaris to RTS like Wargame to Tactics games like Jagged Alliance to Tower Defence like Fieldrunners to Strategy Lite like 12 Labours of Hercules to even Match 3 games like Ironcast.

So for example Fieldrunners has the tags Tower Defence, Strategy, Indie, Casual and Singleplayer. Everything here except Tower Defence is way too general to be used for matches, and I'm fairly certain there's nothing in my above average played games that suggests I like Tower Defence. Yet I still get this matched, among other similar games.

Unfortunately, sparsely used tags are hard to come by, so after depleting those, the algorithm could start matching multiple common tags combined. And only after that go for individual common tags.

To demonstrate what I mean by obscure/sparsely used tags, let's look at some of my most played games:

Victoria 2 - Here we have Grand Strategy, Politics, Economy and Management as tags I'd like to see more of. Less useful, but still more useful than generic Strategy or Singleplayer or Simulation is: Historical, Real-Time with Pause, World War I, Military, War, Moddable, Alternate History, Great Soundtrack.

Team Fortress 2 - Nothing here that could really be used on its own, but if you combine some of the common tags - FPS or Action or Shooter, with tags that aren't commonly used with them - like Cartoony or Comedy, you can get relevant matches.

The next two, Europa Universalis 3 and Crusader Kings 2, are pretty much the same as Victoria, but CK2 gives us the Diplomacy tag.

Civilization IV BTS - Here we get 4X as a new standalone tag, plus Turn-Based Strategy to be combined with others or used on its own when more specific tags are depleted.

Day of Defeat Source - Much like TF2, here we could combine FPS and the like with Realistic or Classic.

Empire Total War - Here we get Naval, Turn-Based Tactics and Real Time Tactics as useful tags, plus the less useful Atmospheric, best used in combination with common genre tags.

Port Royale 2 - Pirates and Trading are two new useful tags.

AdVenture Capitalist - Clicker and Capitalism are good, Funny and Memes probably best used in combination with genre tags.

The next few are mostly more of the same, so I'll jump ahead to an important one:

Tropico 4 - Here we get City Builder, Building, Resource Management, Political, Cold War, God Game. All could be used on their own and all are likely to lead to good matches.

I hope some this can be helpful in improving your project.