Generally the most important Game to study is your own!
that being said, annotated games from some lucid, thoughtful chess writer like Heisman is another very instructive idea.
more generally, I rarely go over many people games, unless they are looking for advice or post intersting analysis. that usually involves playing through them and looking for an improvement of their game..
How much time do you spend studying others chess games? Do you print out their games and study? What is your method? Interested in hearing the various methods that are here.
Thank you,
Joseph
My apologies if this should have gone to a different forum