My two cents. The Way of Kings was the first Sanderson book I read, because I wanted to start a new fantasy series without particularly thinking about the Cosmere (although I sampled The Emperor's Soul first to take a dip, to see if I liked it). So I entered the series knowing almost nothing about the Cosmere, though I had heard about it. To be honest, that fact made the book more enjoyable that if I had read Sanderson's other books before. I wasn't trying to compare it to his other books, find links to the Cosmere, and see the connections between his characters and wasn't in a position to compare his books with each other. In other words, it was pure experience in a new world and I enjoyed it. I might not have enjoyed it as much if I started with Elantris because many of the same themes appear but everything is better in the Stormlight Archives. But the main point here is that only after absorbing and enjoying Roshar and the story did I begin to think about the things going on the background, the deeper things. Mentions of Odium and Honor got me into the Cosmere because I was curious to understand the structure of the universe and the place of Roshar in it. My interest got me into Mistborn, which I enjoyed a lot both for the story and for the Cosmeric stuff. I might be in the minority for being much more into the philosophical and theoretical points of the Cosmere over the cool factor as in "cool, there's a sword from Warbreaker in WoR!" sort of thing (I have not read Warbreaker).