What I love is that even if the "App" doesn't exist, IE10 handles most web pages beautifully - much better than any other tablet web browser (IMO).
For instance, I was really missing the Amazon MP3 "cloud player" as well as access to the Amazon MP3 store (as I had on my Nexus 7). I went ahead and used IE to log in to the web based cloud player, and everything worked perfectly. Once inside, I simply "pinned" the site to my start screen, and now I have a direct link to the MP3 store & cloud player. I've done the same thing for Amazon Prime "On Demand" and the video streaming works beautifully! (something my N7 never had).