Think of all the times developers didn't give you what you wanted. More health, more weapons, faster running speed, etc. Most games have issues that went unnoticed, but **** that, let's go in and fix them. Name the game, then name the issue you would instantly fix.
90% of games (especially JRPGs): Sometimes, I don't want to see my main character in the same stupid outfit. However, FF and other games only let me change the weapon/armor appearance. DQIX happened upon the idea that Saints Row and WRPGs had for years. Every part of appearance is at disposal. Who knows what combinations we could come up with.
Castlevania Curse of Darkness: This was a solid game in the franchise, but a glaring flaw makes it nearly insufferable. Hector jogs at a snail's pace. Perhaps it's simply the perspective of the camera moving slow and not the character himself. Whatever the reason, the ******* is slow as ****.
Persona: I love these games to death, but you can't skip the dialogue scenes. Maybe there are scenes I want to entirely skip, but no, the game forces me to press X the entire time till it's over. Especially annoying when bosses kick my ass. Look at Radiant Historia: everything is skippable. You can phase out conversations until the pivotal choices need to be made. Definitely a step forward.
I'll think of more later.
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"Should I slice off your tongue or break your countless bones? Either way, I get paid; you'll bleed to death and die alone." - Blood Money