Would most definitely say NOOOO.... !!!
Without having seen it, it sounds like a really bad correction work done at the dealership after a damage to the bumper.
I would go back to dealer right away.
The Peugeot 308 I have until tomorrow (where I collect my A3, woohoo!!) has front and back bumpers one shade darker than the rest of the car. This is due to my old colleague being involved in a smaller car crash. The correction work was then badly made, probably without the whole car, so the panels do not match...
At the end of the day, I don't care, it's a rental, but had it been my own I would go crazy.