The Houston Review isn't infallible, there are enough questionable issues relating to some of his conclusions (Tiger doesn't work in hot humid zones far from Brisbane like Darwin, so move to Townsville? That'd be the not hot, not humid, outer suburb of Brisbane...). Furthermore, this is the CDF who supported the purchase of MRH despite knowing of the issues surrounding Eurocopter / Airbus as a contractor. There are other flaws and it's also rather old.
I'm not sure when you are talking about the budget being cheaper to replace than sustain. If you are talking now, well - yes. LAND 4503 is there and it's been my constant point that we should replace now and not defer. But if you are talking in the past, I can't think of when. Knowing what else we would have had to purchase beyond AIR 87's initial funding allocation to support a Boeing or Bell product, I'm not sure how at any point the others would not have been comparable or more expensive.
Generally I'd agree, although I'm actually happy to take some risk for acquisition. But what mess are we in?
@Volkodav is correct and I've actually used his point in the past, Tiger = Collins. There is one line in his post above I disagree with (of the three options, Tiger was the most cost effective - even in retrospect) but other than that he is spot on. It's not in a mess (although it's getting old) and it does what we need it to. Hell - I know individuals who made bad decisions that ended up delaying the capability or hurting the CoA's legal stance. I also know the guys and girls who dragged it kicking and screaming into a deployable, feasible capability.
Your second last sentence highlights the quandary that AIR 87 tender evaluators faced. Of the three contenders, what was "Buy something we know works, with a known support cost, guaranteed development path and commonality with our allies"? Factor that into today, and the LAND 4503 people are going to face similar issues.
In the wider view, the idea that "just buy US and all will be solved" is not a guarantee for success like many think it is. The C-17 is held up as an example, and it certainly seems to be. Some of the equipment we have bought is top notch (M-1), but because of how we use it and the like, often has issues. It's not Australianisation - it's just us breaking different things. Sometimes we go cheap (S-70) that gives us a good capability, but with more issues than are worth. Two things about the latter, one small and one with wider issues that many forget about when talking about US equipment. The first is that no H-60 self-protection gear actually fits beyond the IR exhaust suppressors. Not a biggie - but if we wanted to push the S-70s overseas against a proper threat, it would have needed a bunch of money and time thrown at it.
Critically though, an anecdote. In 2004 the Black Hawk family had bad blade cracks - it was impacting about 30% of the blade fleet. A US Army one actually lost a blade in flight. Well, 2/3.... Either way, our's were grounded until new stocks could be bought. AASPO was excellent, and they were able to tell the user units that the Army Black Hawks were the number 2 customer for Sikorsky. Which sounds excellent - until they went asking who number 1 was. "That's be the US military - and your estimated date of delivery is mid-06". Now, we were able to work around that, but when you have ~38 of 4000 Black Hawks, or 72 of 3500 F-35, or other similar fleet sizes, your "special relationship" doesn't mean squat. When you have 22 of 180 Tigers you can, generally speaking, have a much greater say and much more attention when you need it. Not the only consideration - but sometimes we just don't have the mass to get a say with the US, and their product may be ok, but not optimal for us.