I don't think he gives enough effort when he sees a teammate about to tackle a player. I see some situations where he should be gang tackling but instead slows up and gets lazy. Sometimes he'll wind up watching his teammate get dragged an extra yard for a 1st down.
I think he's capable of doing the whole Cover 1 and Cover 3 thing that Madieu sucked at. But in terms of being a versatile player that Haslett can scheme with? Not as such, rather a stick them 20 yards back and have Meriweather be the complete wildcard, which only works to an extent.