The books and the lore behind The Elder Scrolls games are great! I've been playing since Oblivion and it's something I've loved and enjoyed so much! I don't know about other gamers, but I've talked to my friends and they say that they always drop books and never read them. There missing out on so much in my opinion. The books tell tales of great adventurers, give useful information on the world and there's even a create your own adventure story book!
Most RPGs I play, though they have great gameplay and are really fun, don't focus nearly as much as on Lore as Bethesda do in The Elder Scrolls series. I think it makes the game's environment so much more realistic like the world your playing in has existed long before you started playing. This post is basically me just voicing my mind over this fairly small, but outstanding part of Skyrim and Oblivion that I've learned to really enjoy.
Currently my Skyrim household contains over 120 books some really common and some unique and very valuable. I have read a lot of them, however I really would like to sit down one weekend, boot up Skyrim and just read them all for the fun of it!