It's safe to say that any Linux user will be able to find at least one feed reader that fits their needs. Even with all the newsreaders mentioned here, this isn't a comprehensive list of newsreader alternatives. Which one is best? That depends almost entirely on the user. Most any of the newsreaders would be adequate for users with a small (less than, say, 50) collection of feeds. But if you spend a fair amount of time skimming feeds for work or pleasure, a couple of newsreaders stand out.
http://lwn.net/Articles/421348/

At the moment I'm using Firefox's RSS reader with no issues, so I see no reason to deviate from it.