Game Accessibility Guidelines

To this I'd add: Make tutorials optional!

Nothing irks a veteran RPG player more than an NPC's condescending, non-skippable takeover of the controls to show you how to equip an item.

And some of us like to replay our games, especially on higher difficulty settings (another thing the guidelines recommend having) -- we don't want the game to talk to us like n00bs if we've already beaten it!

Also, many of the suggestions listed under Advanced are rather questionable for games that don't specifically target disabled players.

Adaptive difficulty isn't necessarily a good thing. Besides entertainment, people play games because they want to be competitive with others. In single-player games, this competitiveness usually takes the form of comparing achievements, progress or high scores.

With adaptive difficulty, your progress in a game ceases to be an objective measure of your ability; thus, adaptive difficulty alienates competitive gamers.