No, Jay Cutler is not a wimp. He has taken many beatings as an NFL quarterback without begging out of a game. He has proved quite durable. He has not complained about getting hit. He hasn't even complained publicly about losing games.
He is less than ideal as a public figure. He does not know how to manage perceptions. But let's forget about perceptions and deal with facts - always a useful place to start:
1. He injured his knee.
2. The Bears' medical team told him he probably shouldn't play.
3. He tried to play.
4. He could not play.
If his name were Peyton Manning, and he had left the field gripping his leg and fallen down on the sideline and pounded the turf with his fists, we'd feel sorry for him. Because he has behaved like a spoiled brat during his career, and because he is not aware enough to know how to manage public perception of him, we assumed the worst when we saw him standing on the sideline with that glum look on his face.
I've known many athletes who have damaged their knees. Having a torn MCL doesn't necessarily keep you from walking or standing. It keeps you from performing explosive athletic movements, like throwing a pass or running away from a pass rush.