I can't believe I'm saying this, but I actually like the looks of the Kia Optima and Forte.

You're not the only one saying that these days. The KIA SUV in particular. I think the reason might be the same as with Hyundai. (They are related companies.)
Hyundai hired a German designer that had previously worked for Audi. Look at the body styling and shapes and so on of the new Hyundais (the ix35, especially) and you'll see some resemblance to some of the Audi SUV, and the Sonata to BMW and Mercedes saloons.
Think about what that means in terms of corporate attitude. It means they have done what they considered necessary to achieve their goals.
Since getting a Hyundai recently, I've learned a bit about Hyundai as a company. They are *serious*, they are rigorous in achieving the goals they set. Not simply sales - excellence in engineering, manufacturing, corporate management and employee development.
One little example of engineering and their approach in general... the i10, the little car of the range, had a 1.2 liter engine that has been considered quite successful with its combination of fuel economy, performance and reliability. Last year, with a "facelift" version of the i10, they included a new version of the engine, Kappa2. 1.25 liter, slightly increased output, slightly improved fuel economy and lower emissions. I think most companies (like Ford and VW, for example) would have simply kept that same engine for at least a few generations of the car.