I'm not sure I could persuade someone following my tastes, my favourite games were quite successful, but they aren't the most successful and with the widest possible audience:
Deus Ex
Thief II
Duke Nukem 3D
Myth II
Gothic
(Note that my top 5 and top 10 lists vary with time, as I equally like some games and often choose one instead of the other depending on my mood, the memories of the moment, etc)







