I think its because:
- "film producers don't had any idea about what cars are/were used in the former Jugoslavia", like ElSaxo said;
- the stereotype that is spread all over the world, assuming that almost everything is old and rusty in eastern countries
(1), and new things exists only because of the Mob (you'll always see big luxury new cars, not small popular ones).
I think we cannot hope from that kind of movie to work on that kind of cliché
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(1):I don't see any 2005+ car in the pictures. For me, they're not old, 10 to 15 years is the average age of the cars I owned
.
But it seems that the producers try to "say" us something with this...