Well, you've already got the DRM, so I will ask. Were you more interested in it as an FPS or as an RPG?
If you got it for the FPS, see if you can return it and pitch a fit about the DRM to see if that will get them to give you a refund.
If you got it for the RPG, then give it a fair shake. Once you finish up your first visit to Citadel Station it really picks up and you get the freedom to come and go as you wish. As RPGs go it is really good. Not as good as KOTOR, but nothing really is.