To me, the speed boost is all relative. I don't have Vick, but have plenty of other speed boosts (+8) and fully trained top OVR players. Outside a few D lineman, most of my D are maxing at 125. So, Vick's +2 speed isn't as exciting as which Vick would play better. So yeah, if you are taking advantage of that speed, it makes sense to keep him. But otherwise, it comes down to who plays better.
To me, the speed boost is all relative. I don't have Vick, but have plenty of other speed boosts (+8) and fully trained top OVR players. Outside a few D lineman, most of my D are maxing at 125. So, Vick's +2 speed isn't as exciting as which Vick would play better. So yeah, if you are taking advantage of that speed, it makes sense to keep him. But otherwise, it comes down to who plays better.