Firewalker is a fun and entertaining DLC for Mass Effect 2 but it's over way too fast and it hasn't got enough content.
Completing all five of the Firewalker missions takes approximately from 1 to 2 hours. In this DLC, none of the combat takes places on-foot but you will get to walk around a bit during the missions, even if only for a few minutes. You must be wondering if the Firewalker mission pack is worth downloading. Well, considering the fact that this is free to download from Bioware's website, of course it is worth downloading but not as worthy of playing. If you want to have a look at a few cool sights and play around with the Hammerhead, you should play it but if you are not interested in DLC packs containing barely any content and you don't like short missions, then you should pass on this one because you might consider it a waste of time.