I first noticed it on the BMW 7-series, after the mild facelift.
See how the tail-lights don't match up on the bottom? I don't understand this...I don't think it looks good at all. I think if they lined up on the bottom and not the top, then it'd look a bit better. Remember how BMW used to have L shaped tail-lights? Now they've gone the wrong way about it. Look at the back of the new 3-series coupe.
I think it looks incomplete. SAAB did it too with their new 9-5...it looks okay here but there's still just something weird about tail-lights not matching up at the bottom.
Audi seems to have done a good job with this design because it isn't as abrubt. The lights don't have hard edges which make them look mismatched. Look at the A3 and A4.
I think Audi lost it with their upcoming A5 though. I think it would've looked better if they had done those simple A6 tails, or the sweeping lights like those on the A4. The upcoming Impreza 5-door also has those triangular inner sections. Even the new Cayenne has those little kinks on the inner part of the tail-lights. This isn't quite as bad as the chopped off look of the BMW's lights...but I think it could've been done better.
I don't know...to me, I feel like the designers came up with a great looking car, but the clean styling's marred from one view because of a minor detail. I think it's unnecessary. It's a potentially clean design. There's no need to cut off a piece here or there. If you must, at least do it so that it looks correct. I really wonder what they were thinking sometimes. Can't please everyone though...
Anyway...what do you guys think?