Lions fan checking in!
Sorry but unfortunately I have not much insight to contribute. I'm just as confused as the rest of you. Before the season I thought he as a lock for a 4 rec/50 yard floor with 100 yard/TD upside weekly. Obviously that's not he case, but Marvin is absolutely still an above average receiver.
He is a great team guy and still has good relationship with Stafford. He actually led all Lions receivers in snaps yesterday - more than Kenny G. So, whoever mentioned locker room issue, intentional phase out, I don't think any of those theories hold water. They're just spreading the ball around a lot, and for some reason the offense is having trouble hitting it's stride this year. I have noticed he's had a few drops, and as a guy with supreme hands, it's uncharacteristic and I think he will correct that.
Are better games ahead? Yes. Is he going to be a consistent every-week contributor? We have our answer, he's not. I don't advise running to the WW just to dump him, but I certainly understand managers who may have to cut him out of necessity due to bye, injury, etc.