Maybe have a thing called hall of Games where if the game was on the Popular list it would go there???
You answered your own question bud
Also, every category in AG has its own "opular" section. If you refer to the image here...
...Every genre has it's own section of popular games of that said type, above the list of games. As you can tell, it hasn't been updated in some time, but it is indeed where the popular games of that genre are.
Or you can sort by rating, or sort by plays, for each genre. This will put the most played or highest rated games at the front of the list. The default is the submission date, so I recommend you try that if you are only wanting to play the best AG has to offer.