I know what the kappa is and I know what it isn't. It's a parts bin car with no trunk and a plastic interior. It has inferior braking and poor feedback from the road (vs boxster). It has more body roll and inferior aerodynamics (again, vs. boxster).
Well some of those shortcomings are minor.
Quality of assembly and interior you have to be willing to pay for, but the brakes are just fine, they just specified a pad that is (relatively speaking) crap. Fine for driving to the supermarket but not for anything approaching enthusiast driving. Change the pads and you fixed it. Same with handling - any more sporting and buyers would have been complaining, but add parts available from the factory (or, predictably cheaper, from the after market) and it cleans up the handling a great deal.
The storage space we can't do anything about. And quit bragging that you have a trunk - my coupe doesn't!!
Poor feedback is a result of poorly contrived power steering and they never got that right on anything except late model Corvettes - it seems to be an American failing, from decades of producing vague over compensated steering, perhaps.
The aerodynamics are a non-issue. Yes, we have lousy aero numbers compared to many other cars, which results in slightly lower fuel numbers at legal speeds, but the fact that it also results in theoretically lower top speed is completely academic and something that would only bother people on boards like this one. Who in their right mind cares whether your car would do 140 or 160? It has zero practical application (except to get you tossed in the can if you actually test it out).
The Kappa is a compromise like all cars. Some of the areas they compromised in bother me (space utilization) some don't (aerodynamics), but the end result is pretty good.