Indeed. People take their late war monster and then do something stupid around a Brewster or P-39 or P-40 and get killed, then whine about it because they feel (yes feel, not think) that the monster is supposed to out everything the POS. Of course in reality there are almost always tradeoffs and powerful engines that bring small, low drag airframes to 450mph are heavy causing turn radius and low speed handling to deteriorate.
If you look at the B-239's usage and K/D ratio in AH you see it is nothing special and claims of it pulling a 180 and chasing down a faster fighter are absurd excuses to justify why one just died to such a poor performing fighter.
The B-239 is not exceptional in any way, however you are exactly right - one of the reasons I stick to flying 20 eny fighters is they are not overated or underated. I can still catch someone much easier then if I were in a B-239.
One tour I ended up #1 in fighers flying the C.205 for a reason - people always considered it wasn't a threat until that big gun package started blazing away at them then they cried foul.
205 isn't nothing special, it climbs well and does 400 at 15k, I was amazed after the first handful would try to out run it, or out climb it expecting their late war monster to just pull away and end up getting killed.
Against a decent pilot, I was dead pretty much most of the time - there is no "cheat box" for the 205 to escape any real situation (for example a co-alt spit 8 will just school it).
Same people that get schooled by a B-239 are same ones who whine about everything, I've flown countless times against 239s and i've never seen anything special - unless its 10k above me I really don't even worry about one.