iRacing, rFactor, and all the Simbin titles are great in 3-D.
I didn't think dirt2 was bad at all, just some of the shadows appear to be out of place under other cars. If you race from the cockpit, it is not very noticable. The dirt2 cracked windshield and water splashing the windshield effect is really cool looking in 3-D.
Biggest thing with the anaglypic glasses is making sure the lenses are the same red/cyan colors of the 3-D, otherwise you'll see some ghosting.
They will make you want to go buy a 3-D monitor. At least they did for me.