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The Detroit Lions' 2013 season is in the books, mercifully capped by a 14-13 loss in Minnesota. What was once so promising faded to another year of bitter disappointment and frustration.

It's hard to believe, but there really were a lot of positives for Detroit this year. These grades will reflect those high points as well as the December doldrums.

Every regular starter will be graded here. In cases where players shared roles, all will be addressed as long as at least four starts were registered by a player.

The grading criteria here are a little different than the normal weekly grades. This is more of an overarching impression for the total season performance. Expectations are considered but not heavily weighed.

All stats used here are courtesy NFL.com. These slides will also feature scoring figures obtained from Pro Football Focus (or PFF), which requires a subscription to view premium statistics.

Here are the regular-season grades for every Lions starter: