I think the key for me is that I rate according to the general standard of the era, which is SO much easier to do when reading everything in order.
At the moment, my numbers are:
1 - 1 issue
2 - 24 issues
3 - 33 issues
4 - 14 issues
5 - 1 issue
I think that the 1s will stay reasonably low for me, because it tends to be a rating that I save for stuff that is truly appallingly bad or actually offensive in some way. I'm sure the 5s will increase, though, once I'm reading more about my favourite characters. For instance, the one five I have so far is actually for Avengers #4, which is a long way off where I'm actually at in the order

I'm not even
remotely objective, but at least I own it

I'd like to think that eventually the 2s and 4s will even out and the 3s will be a lot higher in comparison to everything else. Right now, the 2s are pretty high because of all the Ant Man and Torch stuff I've been wading through.