Yeh if left alone like they were Anzac can amass quite a fleet and then do some real work. Subs are cheep so if you can keep your transports alive they can be the backbone of a naval fleet to push and at the very least pull some Japan fleet away from other key positions.
Kill America First
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Assuming that germany is in gib on G2, if Japan declares turn 2, then at most, he has 6 loaded transports with 6 planes in range of the west coast. US drops 10 units in West US and lands some air. Not counting the potential blocking he could do. UK moves the canadians down, and/or US can block germany or just super stack east coast. Either way, they have no turn 3 attack on the US, So that is another round of big unit stackage. Turn 4 will have italy clear blockers but the US will stilll have a large defense ready.
Turn 3 Declare would mean that US still blocks a japan and so then the income for the turn can be focused on the east coast. If the US can at least delay to turn 5, then the axis have lost their only real window.