Worthwhile for diehard fans.
This DLC fills a hole that existed in Mass Effect and lets you fight like you've always wanted to. The reason it is not as good as the previous DLC is the complete lack of story or moral choices. In the previous DLC, there are a couple chances to choose paragon or renegade and and some considerable story. Neither of those are present in this package. Pinnacle Station also only take about an hour to beat. The 3 hours promised by Bioware would only be possible if you had to retry many of the missions.
So, its a good package that scratches that itch of wanting to test your characters fighting ability. It could have been more by either giving more options for the matches, like say Shepard fighting alone, or having online leaderboards. It also sacrifices the story, which has always been a big part of what makes ME great. Still, its some good fun and provides much more than the standard ME sidequest.