They're not great, but surely they can be buffed up a lot better than that?
I can understand if there was corrosion on part of the pistons that go into the caliper, but only one of them looks like that could maybe happen, the other 3 are still going to be exposed and not enter the caliper at all so shouldn't cause a problem.
They're unsightly and not perfect but so what, they'll be covered in shit again in no time, no matter how new they look going in.
As i said, one does look suspect though so if that can't be improved then at the very least that will need changing, but i don't think the others are bad enough to cause any problems, unless you buy some mega wide pads.
And use plenty of red rubber grease on refitting.
It's obviously your choice primarily though, and just my personal opinion.
If you ride all year round like i do the edges of the pots tend to look like that anyway, due to the amount of salt on the roads in winter, that's why i recommend cleaning the pistons with a toothbrush, brake cleaner then reapplying with red rubber grease at least once, or even twice a year if you can be arsed.