It can be any game that you've played. That you feel could have became something more. I'll start off with a game I feel has potential.
El Shaddai: Ascension Of The Metatron- Even though I platinum and had alot of fun playing this game. There are somethings that I feel could have been better. The combat needed to be improved. There's only 3 weapons 1 power and no upgrade system. Throughout the whole game you'll be pulling off most of the same combos, and fighting the same types of enemies which will feel repetitive overtime. The game also needs more variety and non linear levels.
The story was good but could have been told better. There's some parts in the game that might be confusing and hard to understand on your first playthrough. Now there is a sequel to this game being made. If they address the problems with the first game I'll be happy. The game has a cool concept and if the developers put more ideas into it. I think it will become a game that alot of people will enjoy.