Like em or loathe them, the Opv's are doing thier job in Antarctica recently and now in fiji with much needed assistantance with disaster relief, along with MRV Canterbury. Given the 500 million budgeted for 7 vessels/ Protector fleet, i reckon we got value for money.
At todays prices that would have barely covered the price of a modern frigate! Even the Irish Navy dont have frigates, an Mrv, or Navy tanker nor do they even operate helicopters off their Opv force anymore. All i can see the main gripe with them is they arent as well armed as a frigate, they weren't intended to be.
It is not just that they "are not as well armed as a frigate..."
Part of the issue is that the armament is so limited in terms of quantity, capability, and arc... that the OPV's might be unsuitable for operations in areas where there could be hostile FAC's. This means that anti-piracy patrolling is either out of bounds, or more dangerous than it should or needs to be.
One of the other issues, and IMO perhaps a greater one, is the limited amount of flexibility now, and in the future (at least at a reasonable cost) inherent to the design. Granted, the ice-strengthening plays a part in this, even more so than intended due to design flaws, but still...
As for the Canterbury, I do feel the MRV is better than nothing, but it does really seem like the people making the decisions should have been aware that some of the planned roles required features which opposed the features needed for other roles. A sealift vessel for instance, requires volume/lane metres and available cargo displacement, and when the correct range of displacement is aboard and properly trimmed, the ship will ride correctly. A patrol vessel does not have or need the sort of volume or displacement for cargo, instead just the needed fuel and stores, and will ride correctly then. If one takes a cargo vessel and either removes of puts in insufficient displacement, the vessel will not behave normally at sea, with greater motion than intended for the design. In order for Canterbury to perform the intended patrol role, a significant amount of ballast would be required, otherwise the crew could be come injured, and/or the ship & machinery damaged. It is particularly distressing that this sort of mistake could have been made, given the service difficulties encountered with the previous logistics ship, HMNZS Charles Upham when lightly laden.
I do feel that Canterbury is a better choice for the RNZN than the 'Upchuck' as it was know, but not by as much of a margin as it should have been. Particularly since the 'Upchuck' was decommissioned in July 2001, and either the RFI or RFP for Project Protector was initially sent out a year later.
Similar concerns exist about the Canterbury's SA and self-defence capabilities vs. low-level threats.