I am sure this must have been talked about many times but!!!
It can not just be me that thinks the fit is just not acceptable.
Rocket Man
Which fit line are you concerned about?
In general, the front and rear top edges should be an even fit, though as Jays has said, there needs to be clearance due to the body flex.
Where I find a variation is along the line at the bottom edge of the bonnet, where it meets the wing. Again, there needs to be a clearance, (but the gap should be fairly even along its length); however the size of the gap does vary amongst different cars.
I am not sure if this was a model/era issue, but the variation is noticeable on your fingers, when you open the bonnets of a number of cars.
In my experience, MMC take immense pride and trouble in the fit of the bonnets, as anyone who has seen John Bishop and the boys working will confirm.
Bud