Rather obviously, I haven't read all British test reports, but I have also never heard a British pilot say he liked an AMerican aircraft except for Eric Brown saying he liked the Wildcat ... nee, Martlet.
It isn't a jab at the Brits at all, just what I've heard, including 20 years of museum visitors. Also, several former foreign fighter pilots seem to have liked the F-86. Not specifically as opposed to anything British, but in general. I'd view that as rather "normal" for most military pilots of any nation that produces it's own military aircraft.
As an aside, all who have flown the Folland Gnat like it a lot, but most wouldn't choose it for a mission because just when you start having fun, you run out of fuel. Without tanks on the wings, it is in a state of fuel emergency when you start the engine with full internal fuel. If you HAVE wing tanks, then you can at least take off and climb a bit before being in a state of fuel emergency. But, if you're flying a Gnat over an airport doing an airshow, it's marvelous fun, AND the fuel is right there on the ground to go do it again!