I would really hate for a bad apple to derail this topic and turn this thread into another locked one. Let's stop digressing and get back to the discussion.
As others have noted the Superhornet should have the first-look, first-shot advantage over the Su-30 in a BVR engagement. The Australian airforce does have the option of converting some of their F/A-18F's into F/A-18G's at some point which will also help mitigate the Su-30 in a potential BVR engagement. The only real advantage that I can see a Su-30MK/MKI having over the super hornet is a kinetic energy advantage and a range advantage.