I don't think you can use interfaces to achieve polymorphism with respect to more than argument. Consider the problem of defining the interface of addition:
1 2
type ISummable =
abstract Add: ISummable -> ISummable This is not so nice, as this implies that each implementation A of ISummable must support addition with any other implementation B of ISummable.
Another minor problem with this approach is that the specification of addition is not symmetric, one of the instances of ISummable must play the role of the "this".
With respect to performance, I wonder if the interface approach might not be better though. I am guessing here, but I expect the CLR may be able (some day) to optimize calls to virtual methods, but I don't expect it would do so with a dictionary object.
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On page 108-111 of Expert F# a operations dictionary method is outlined for making functions generic. When would it be considered appropriate to use this type of method to create a generic function in comparison to using an inheritance structure filled with interfaces and abstract classes/types.