Go to http://www.squared5.com/svideo/mpeg-streamclip-mac.html and download Mpeg Streamclip (every editor should have Mpeg Streamclip anyway )
Inside the package you will find Utility MPEG2 Component Lion that will help you install MPEG-2 Playback Component for QT7 (Lion).... although I'm not 100% sure that will solve the issue.
I did what they say but the videos still don't import correctly on Premiere. Only the "video" track appears and is a completely black still at 1fps. Only the video "length" is correct. If I import the audio demuxed, says that it don't recognize the format. The video plays fine on MPEG Streamclip, yet the last time I exported a MPEG-2 video from there in another compressed format to use in Premiere, the Premiere output video ended with the colors all wrong. Quicktime 7 plays the videos, but sans audio. It frustrates me a lot especially since I could import the very same videos directly in Premiere without problem before.
I still don't know how to solve this. Premiere Pro on my iMac with OS X Lion don't import .vob files, however if I change the extension to .mpg/.mpeg they import, but sans audio and a black still as the image.