This site has the LARGEST selection of comic books you will ever see, be it in a store or online. The customer service is very well handled and the prices are outrageous! This is a site that all comic book fans need to visit at some point in their lives.
If you want to keep up to date on Batman: Arkham related news, then this is the place to go. It has everything from official announcements, to rumors, to community discussions. It's a good site, and almost everyone knows each other.
Although the site has plenty of new news stories, it doesn't exactly stay up to speed on certain things. I find thousands of comic book news articles on comicbookmovie.com that contain new information that cannot be found on superherohype.com.