I own a 2003 Kia Sedona and a 2006 Sonata and have noticed a few things
also.  The Hyundai uses name brand parts such as Bosch while Kia uses
off-brand, generic parts to keep costs down.  Service at my local (35miles)
Kia dealer has been dismal, to say the least.  They've screwed up more
things than they have fixed.  Today, I noticed what my wife (it's her daily
driver) has been complaining about since having the transmission fluid
changed at the dealer.  When you shift it into gear, it sits there for about
5 seconds before shifting.  Guess what, the fluid level is low and out of
sight on the dipstick!  Now I have to call the 'service advisor', who is
nothing more than someone who writes down what the poor customer tells him,
and drive 70 miles round trip to have them put fluid in the transmission,
which is what they were supposed to do in the first place.!.  A month ago, I
had the alternator go south just after picking it up from an extensive
fluids and spark plug change, which they talked my wife into.  If you look
at the manual, none of the fluids except the oil had to be changed to
protect the warantee.

Of course, I haven't had the Hyundai long enough to know about the service
department there but they sure seemed more professional and knowledgeable
when I talked to them at the time of the sale.
I've also had a shimmy in the steering wheel from day one on the Kia which
the dealer repeatedly blamed on the tires.  I even went to a local tire
store that did a diagnostic on the tires and wheels that showed nothing
wrong.  Kia reluctantly paid for it but still said nothing was wrong except
the tires.  I just put new tires on the car and, guess what, it still
shimmies or shakes the steering wheel at slow speeds.
For my next servicing, I plan on using the Hyundai dealer for service on the
Kia.  I do get free oil changes for life on the Kia as part of the deal.  I
should also mention that free tires were part of the deal, but they put OEM
tires back on it, which are bottom of the line.
Even though Kia and Hyundai are sister companies, there is night and day
between them.

Well said Ranger45.

I am the assistant manager at a Kia dealership, and I would like to
oint out a few problems with your statement.  Kia DOES cover
adjustments for 12months/20,000km, headlights are covered under
warranty for 3yr/60,000km.  In your reference to generic parts, NGK
platinum plugs, michelin tires etc. are not what I consider sub-par.

The job of a service advisor is to listen, understand, and respond to
customer's needs. At no time should the advisor become defensive (if
trained properly).  Yes customers can be difficult, but their
frustation is not your problem, their car's problems are yours.

The dealer has the responsibility to act as a representitve of the
factory, thus satisfing your customers needs before the lemon
laws/CAMVAMP procedure.  (In 5 years, we have never had to settle an
issue with an arbritator's assistance.)

Kia boasts and backs up one of the best warranties in the business,
during delivery, our service dept. is introduced to the new client, and
we go through the basics of car care with these clients.

I hope you have what sucess you can in this industry, another option is
looking for a new career, where public service is not involved.