Got COD4 a few days ago and I am really enjoying it. I have finished in the training room now and I am completing missions. Takes a bet if getting use to but I really like it, I can't wait until COD5 comes out.
I take it the patch question you deleted coz you sussed it?
Anyway, i think the 1.6 patch includes all before it, and you have to install the 1.7 one after. I think, cant remember for sure. 1.6 is the biggie, as it has the new maps in.