I think that having screenshots showing the title screen of games is pointless. In most cases it only shows the name of the games (which already appears on the left) and tells nothing about the game itself.
I suggest to have gameplay screenshots whenever possible, even if it's just a shot of the very first second of gameplay.
Such screenshots would :
- give a better idea what the game is about
- help people who are looking for games to play choose between games
- help people who are looking for a game they used to know, but forgot the name.
However, I am only willing to make gameplay screenshots for NES and FAMICOM games.