OK,i know this is late, but only a couple of thoughts:
as i see it, fun factor only hapens after the "mine clear thingy".
Before that, what we have is a nice piece of cutscenes, followed by a very well scripted mine clearence sequence.
Did i mentioned the fabulous intro cutscene?
It was a very well done job , because it sets up the mood so well, that one gets the feeeling of being part of something bigger than your litle team!
All considered, i would give it an 8/10, scoring 9 at cutscenes and scripting.