I never noticed that, but it's the case on the Mercedes 190 too.
I quite like asymmetry in vehicles, mainly for the reasons
@niky mentions - functionality. Sometimes that functionality is dubious - the MINI Clubman's side doorwas great in LHD markets, but opens into the traffic in RHD markets (ditto, I think, the Veloster) - but at other times it's great.
Someone else mentioned that it's okay if it's subtle, which I think pretty much sums it up. Vents and grilles offset to aid cooling to a particular area work well, for instance. And functionally, the asymmetrical wheelbase on a Renault 4 (to facilitate independent suspension despite having torsion bars at the rear) can't be faulted, given that it doesn't cause any problems in a car where high-speed cornering isn't required.
The exhaust thing
@Icy J mentions above is an interesting one. I don't mind offset exhausts - some cars look very odd with pipes either side, particularly vehicles with no real degree of prestige (original Beetle aside - those look wrong with single pipes). And when it comes to centre-exit exhausts, I sometimes like it slightly offset - there's a necessity about its placement, rather than the feeling someone has taken the time to center it for purely aesthetic purposes.
If we're to continue the "humans like symmetry because people are symmetrical" thing, then an offset element, rather than a truly asymmetrical car, is like a mole on a supermodel. Having a skin defect perfectly central (on your nose, or chin, or forehead or something) would look very odd indeed and even unnatural, but on a cheek it sort of "works". To extend it further, I reckon tattoos would look quite weird if they were mirrored. And let's not forget, clothing is often asymmetrical - shirts have pockets on one side, to give just one example.