I've set up my Pi with minidlna. My PS3 sees it and I can play media files of most sort. There are a few minor performance issues though. Playing video is sometimes a bit choppy (which I can live with), but what really bothers me is that it can take 10 seconds or more to start playing a mp3. So browsing through music becomes very annoying and almost impossible.
I have a WD Passport USB powered external HDD hooked up to the Pi with the media files on it. I can transfer data at up to 30MB/s so I don't think the drive itself is the issue.
Is this a common issue? Has anyone had similar experiences?