I've flown the bloody thing a little, did a series of duels vs a squaddie in a Spit16 once and won most of them (albeit, we started out at 15K and the fight tended to climb). If you are comparing it to any of the earlier marks of Spits, well yes, the XIV handles worse than what are otherwise the easiest-handling a/c in the game. Sure, and a wrong-turning engine doesn't help. But no worse than a Tempest's handling problems really, or even a Kurt4s for that matter.
And the Ta-152...really, we are bringing this up? Lousy argument for unperking the XIV. The Ta-152, for all intents and purposes at MA alts, is a slightly slower Pony with big cannons. And the XIV's handling quirks do not approach the oddities of the 152.