Well, yes, but you still have to be dissatisfied with the impact of the valuation on finance, not just the valuation. If the valuation causes a higher LVR and thus interest rate, then you could cancel because you're dissatisfied with the interest rate.As I understand it (and everyone's contract is different), you should be putting "Subject to finance satisfactory to buyer" or something like that, and then you don't have to be unable to get finance to get out, you just need to be genuinely dissatisfied with any finance you're able to get, which could be caused by a low valuation.
But in the scenario mentioned - not too different from xQuiz8's - if you only apply for 60%, get approved, and then find out the valuation was low, you'd have no grounds to cancel. You're not even entitled to know what the valuation is; the only thing relevant to the finance clause are the conditions relating to the offering of finance.
I know this form personal experience; when I was a victim of professional negligence during conveyancing, I wanted to sue, arguing that I could have withdrawn on the basis of my finance clause had my conveyancing been performed competently. It was explained to me that I couldn't, even though if my conveyancing had been done accurately I would NOT have obtained finance. The finance clause is interpreted very narrowly by the Courts.