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Many NFL rookies lived up to expectations in 2012, and some even far surpassed anything we could have ever imagined.

These players didn't. Not a single one of them. Every single player on this list came up short.

Disappointment comes in many ways. Some players were injured, and others were just plain terrible. Some were put in bad situations.

That said, some will improve. There may be a future All-Pro or two on this list—but we'll get to that.

Here are 2012's most disappointing rookies for every team.