Go to steam and get your pre-load on for the free weekend of UT3. http://store.steampowered.com/news/2830/
If you plan to play RenegadeX, you'll need a legit copy of UT3 so buy it while it's cheap on steam for $8 http://store.steampowered.com/app/13210/
IMO DM and TDM are playable as usual but Warfare is just one big chaos. It's ironic that Unreal editor seems less stable than Hammer.