http://jogin.com/weblog/archives/200...real_obnoxious
This is the first result I got when I googled "real player sucks". I don't know who this guy is, but he pretty much nails why nobody should ever use Real products, and the page links to two other interesting entries with info from former Real employees. The software is user hostile, it knowingly deceives, it steals resources and it opens you up for spyware. I'm sure Willie (executioneer) has an opinion on this as well.