There's been about a half dozen threads asking who should be the MVP, which is getting a bit stale, as far as I'm concerned. (nothing personal against those who made these threads, but there's so many of them)
What this thread is about is:
Which player has disappointed the most for their respective team this year?
I'm not necessarily asking who you think is the worst, but who had high expectations and hasn't come through (and your reasoning, of course)?
Phillip Rivers gets my vote, mainly because I thought he was due for a comeback year and hasn't really improved from last year's shoddy performance.