It's not that good. Its vulnerabilities are too easy to exploit for 3-5 perks.
What vulnerabilities? It has none, other than the putative fragility IF it ends up in front of the guns instead of the other way around. It might have the best game in town as far as defensive possibilities goes, due to a combination of roll rate and good turning.
There's no other planes for new players to use as a trainer.. It allows them to make quick corrections like no other plane allows. That lets them make consecutive attempts at any acm quicker, so they progress quicker.
I wouldn't perk it for more than 2 points.
There are plenty of other planes to use at trainers which are relatively easy to handle *Most* AHII airplanes are "easy to fly" in the conventional sense, meaning they take off, land, and recover from stalls with little/no difficulty or surprises. You want an easy-to-fly plane, the HurrIIC is a rock-steady platform, and with its turn radius, guns, and over-the-nose views, better for the typical new-guy style of pull back on the yoke until it comes into view and hammer away. The SpitXVI OTOH, represents an airplane that is both relatively easy to handle *and* double-superior to a huge chunk of the plane set.
The "New guys need very good planes so their first flights will be easier" could be used as an argument to unperk practically anything, the C-Hog (What gun package is easier to use than quad 20MMs? And its a pretty good platform and fighter to boot), the Tempest (Quad 20mm plus the noob gets to be untouchable), or best, the F4U-4. (The best plane. 'Nuff said.)