I agree. But if you'd have seen my Mark 3 repair you'd have been gobsmacked at how different it was. And that came out of a VW dealer!!!
On a different tack i just bought a match pot of magnolia paint to touch up some marks in the house. it may as well have been bright pink it was that different. In the end I've had to buy an "Ivory Cream" to match the current magnolia - how can that be?
I'm sure someone in the know will be along shortly to tell us the technicalities of it all.
Many many years ago I had a white Pug 205 GTI 1.9, got a scratch on a side panel, the painters did a lovely job spraying it with no masking lines or overspray but the colour match was dreadful in certain lights. My next car was a mk2 Golf GTI (we're going back to about 1992 here) in white, and that had a different white on one door, caused me no end of annoyance as nobody could match it to the original despite using VW paint.
And as for magnolia walls, I painted the hallway and dining room this colour a few years ago, first two tins were exactly the same, the third was more of a yellow colour, so I share your grief andykram.
Back on topic, I still can't get my head round the pricing on the whole mk5.5 Golf range to be honest. I take my hat of to VW though, everywhere is in recession, other makers are slashing prices to get sales, and VW bring in a barely facelifted model, market it as 'all new' and hike the price handsomely - and peeps are rushing out to buy them. No wonder VW shares are so expensive. Genius.