I agree with everything you said, except for the "No" part. The OP did say "flop" and Razor Coast is the opposite of that. Endzeitgeist's review is right on the money (as usual). RC is brilliant, albeit it does have its flaws.
Flaws that could be seen as deal-breakers for some (which would constitute a "flop" for those people). And whether you agree with the "no" or not - it is highly unlikely that said individual has an "exclusive on that opinion". In fact, that's factually false (even as hyperbole).
And... that's enough of Razor Coast when this is about Plunder & Peril!
I do find it interesting that the level range for this particular 64-page module is (seemingly) less than the previous modules of this size (it is ~3-4 levels like a few of the others, but in a lower level range - and nowhere close to Dragon's Demand range, which I didn't like at all).
I consider that a very good thing.