this one's sort of a multi-player version of shadowgun, so take that how you may. fwiw, i would recommend trying Dead Trigger -- same developer but with zombies. I never got far in shadowgun, but have played a lot of DT. in addition, one of the nova or modern combat games by gameloft are generally good
Thanks for your input. I may have to try those out.
I got stuck on the Digger (?) level and after a couple of hours gave up on it.