You're probably thinking being that this is a free game that it is bad huh? Well you're wrong. It's quite fun.
You can either choose to be a gunner (person that shoots down the cars) or you can be a driver. And it has co-op so you and your buddy can play together. Another plus is that it has achievements... and they're easy too. :D
It has 3 modes. Multiplayer (online), single race, and campaign. The campaign is only 3 races on 3 different tracks but hey, it's a free game and that doesn't bother me. I didn't have to pay for it.
Harms Way is a good game and I'd definitely recommend you downloading it. It's free (well right now it is. Not sure if it's something that's for a limited time only) and it's fun.
I give Harms Way a score of 7.7 out of 10. It's "Just Plain Fun".