If you don't mind my asking (I'm a noob to "old-Who" too and wouldn't mind getting acquainted), how does one go about "watching" and rating episodes when they are missing?
Every episode exists in one form or another, even if it is just audio with pictures. I've been watching fan-made reconstructions. They're not particularly difficult to find.
I felt it was worth sticking with because you do get characters referring back to things that happened in these 'missing' stories, and it's nice to get a complete picture of what's been happening (even though generally the stories are not linked to each other).