Yes, like "the hood ornament on my Mercedes appears to be misaligned clockwise by 0.75 degrees, so I'm going to return the car and walk 20 miles to work..."
For a 0.75-degree misalignment, re-seating the grid screen in its' socket will probably fix the "problem". And I'm still skeptical than anyone can realistically "eyeball" level to that degree of precision, even with a grid screen.
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A misaligned hood ornament will not affect the use of the car in any way. Incorrect viewfinders directly affect the use of a camera. And that's why people are returning the wonky items.
I rarely have to straighten horizons and I don't use tripods or grid screens either and if I do, I'd say 0.75 of a degree is surpringly significant rotate. But then when I go into people's houses all the pictures usually look wonky to me, because they are normally a little out. Some of us notice these things, some don't.
And as mentioned above, if you aren't that accurate then the misaligment may make one is less accurate to the point of wasting time in PS correcting lots of images.
Just because you think it's not a problem doesn't mean it isn't a problem. Besides for a very, very expensive camera like the 1DsIII, suggesting one bodges the screen seating or uses sticky tape to make up for a manufacturing defect are really stupid and naive suggestions.
The fact that numerous websites are reporting issues, the fact that when talking about the new Canon + Nikon in my local shop, the first thing mentioned was that all their Canons had a problem and there was even a chap in the shop who'd returned one because it had a problem, tends to indicate that they may actually be.....a problem.