Most things have already been said but Im gonna chip in.
Awsome plane. Really great one. One of the best we have. BUT its not a easy plane to fly. While there are harder planes its still not a dweeb friendly plane to fly.
Since you cant dive very well in it and you have to trim manually when you do its not something the dweebs want. The dweebs want the "if all fails dive to the deck and run for home" option, the "if all fails turn till you puke" option or the "no matter what ho".
The turn till you puke crowed either takes a Zekke or a SpitV they wount fly the Frank because they can dive in a SpitV and dont see any benefits over the Zekke (as they cant use the vertical). The drop like a stone and feel crowed obviously go for lalas, runstangs and doras. For the HOers the gun load out aint cannonized enough so they go for the nikki. This imho is why you dont see any mass usage of this great plane.
Reason I dont fly it as much as I could is that Im currently focusing on planes that will be in ToD and learning them one by one PLUS that the Frank is a bit cursed for me.
The curse, pilot wounds and engine oil hits. I dont know why but I tend to get either a pilot wound or a engine oil hit on like 20% of the hits I take, if not more. Find it a bit frustrating actually even more frustrating then the paper wings of the spit. In the spit when I loose my wing I die, done deal.

Tex