An extremely thought-provoking question about the Batman games

*Knight

• Action-Adventure
• Adventure
• Adventure - Hidden Object
• Arcade
• Board Games
• Card Games
  You probably won't need either of the above if you're not as hardcore into the genres as I am :P
• Completed Games I'm done playing, either because I've finished them to my satisfaction, or decided they're not worth ever picking up again. Basically a discard category in place of outright hiding games. I find it easier to manage this way,
• Fighting Includes single player brawlers, unless they're better fit for Action-Adventure
• FPS
• Horror
• Multiplayer - Local - Co-op
• Multiplayer - Local - Versus
• Multiplayer - Online - Co-op
• Multiplayer - Online - Versus
• Multiplayer - Team PvP / MMO
  The multiplayer categories are the only ones I sort games into multiple categories on, since it's useful to know if a game is both local and online, or has both primary co-op and versus modes. If the modes are just side modes (ie, a small versus mode in a primarily co-op game, or vice-versa) I only sort by primary mode.
• Platforming
• Puzzles
• Racing
• RPG - Action
• RPG - Roguelike
• RPG - Tactical
• RPGs ie, All Non-Action, Non-Tactical, Non-Roguelike RPGs.
• RTWP Real Time With Pause
• Sidebar Games that I've completed, but may want to come back to one day
• Sim
• Strategy All strategy games not in following genres. Mostly Grand Strategy and Miniatures-style Tactics and the like. Technically I could split it up further, but haven't found the need to yet.
• Strategy - 4x
• Strategy - RTS
• Strategy - TD Tower Defense. :)
• Trashed For Games that simply don't work. Basically serves a similar function to the Sidebar category- it's for coming back to later [to see if they work then]
• Trashware A recent category, ever since I started bothering to farm games for cards (for funds for giveaways :'P). Again, like Completed, one you can just use 'Hide Game' for, instead, if you don't feel the need to be as organized with it as I do.
• Games The default unsorted category, but I use it for (games I'm actively playing, or intend to play very soon). Basically all my SG wins are in this category :D

Of course, you ought split your own categories based off of what tags are important distinctions for yourself. (For example, you'll note a lack of an 'Action' category, simply because RPG, Adventure, Multiplayer, etc would always take priority- if it didn't fit into any of them, I'd just lump it into Arcade.
Likewise, I sort by how a game plays out- for example, a RTS 4x game would go into RTS if it was fast-paced/micromanagey/etc, while it'd go into 4x if it was more of a slow-paced Europa Universalis type of real time.

Despite being my most stocked Genres, RPG, Adventure, Action-Adventure, and Strategy aren't split any further, simply because the nuances of the games sorted into them don't matter to me- for example, whether it's a Point and Click Adventure game or a Cinematic Adventure game isn't really an important distinction for me when picking a game by mood.
Likewise, whether it's a diablo-clone or an action JRPG, my preferences will be based more on the individual game than the nuance of genre- my overall mood'd simply be for an action-RPG.

In other words, all my categories are sorted down to the point where I can pick games solely off their individual merits, knowing they'll match the certain mood their genre label indicates to me.
And that's why I've got Batman under Action-Adventure, rather than Adventure-Brawler- in the end, the nuance just isn't important: I'll be playing it because I'm more in a Batman mood than a Tomb Raider mood, not because I'm more in a Brawler mood. :)