Who says there should only be 2, even? All of the rock musicians in the community I know of (save for M-H) use 4 rhythm guitar tracks, and where they're panned differs among people as well. I like to have two 80% left and two 80% right. Some have one 100% left, one 50% left, one 50% right, and one 100% right, like Nekofrog.
If 2 works for you like it does for M-H, then go for it, but I've always had much better results using 4. Here's a little demonstration of my tone. Pardon the horribly off-key leads.
http://tindeck.com/listen/knrb
EDIT: I apply the same EQ to all 4 of my tracks but try it out and see how it works for you.