Some parts can have a lot of finish wear. My CMP kit came with a FS with very little finish and lots of very fine surface rust. I'm going to have it reamed and refinished, so not a problem for me. My op rod also has some finish wear and I'll have it redone as well. Some of the other parts I may have redone so the whole rifle looks good.
Some folks want original finish, some want the parts to look new (and match), some want the parts to have an "experienced" look. Each to their own. I have some of each (no rust!) and like them all.