How Do You Think These Coins Would Rate?

1) MS-64.
2) VF-35.
3) MS-60.
4) MS-63.

Also, there is this scratch on the 15 kopek coin like a number 4. Do you think someone could have deliberately done it or if it was something the mints would have done at that time? I wouldn't have seen it if it weren't for the close-up picture so I find it hard to think of a 'saboteur' meticulously and very carefully tracing little characters out with a sewing needle or something haha

Thanks Joseph, this is a very helpful guide! Well, among the points I've read were uneven tarnishing or grime, scratches from using wire brushes when cleaning(?) and an unusual sheen. I'm not sure if I've managed to detect signs of cleaning on a few allegedly uncirculated coins I've been looking at, but all of them looked uniformly free of dirt/tarnish, only thing was that as perfectly sharp as the details were without zooming in, every single area was also evenly worn and they seemed strangely worn on the microscopic level. I don't know if I've done myself a favour but i'll be sure to read further anyway.