I have tried all my 9 Canon AF lenses (ranging from 17 to 800mm) and ended up with micro adjustment at or very near 0 on my1D4, they also focus just fine on my other EOS cameras (5Dc, EOS3, EOS 33V and EOS 50E) am I just lucky?
I am not questioning that micro AF adjustment is not a great confidence builder, just saying that I have not found a use for it - except for confidence building!
If you were using a yard stick and duck tape like the OP then yes you are lucky.
My super telephotos on my 1D IV were dead on. The only ones I had problems with were the zooms. With my experience with 7D's, 5D's and 1D models I think Canon takes more time in getting the 1D bodies and the expensive lenses right.
I wasn't using a yardstick I was using AF targets angled at 45 degrees to asses where the lens was focusing. I must admit that I haven't tried out my Canon 800mm F5.6 as the depth of field at 6 or 7 meters is so shallow, wide open, that any error would be immediately apparent as the depth of field is almost zero! I simply tried it on some, very co-operative, Kingfishers - eye in focus + very little else so it must be spot on (according to DOF Master it is only 1 to 2mm at these ranges and aperture). My previous long lens (a 600 F4 L IS Mk1) was also spot on on test targets.