Gamerlist shows games and their average score1 from the top critics in the industry. Select the platforms you own on the Preferences pane, then mark the games that you already played, the ones you want to play later and the ones you never want to play. That will narrow down the main list as the top scored games you never played, and as new titles are released and reviewed Gamerlist will automatically keep your list fresh with the best new games.
You can filter names to ignore them across Gamerlist. For example, if you are not a fan of rhythm games, writing "rock band" (without the quotes) into the Filter Out box would avoid you having to manually mark every game in the series as something you never wish to play.
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1 Scores based on Metascores from Metacritic.com. This site is in no way affiliated with Metacritic.