Yeah, if you get the chance to see it, do it up!
The thing with these found footage movies is the whole point is to make them feel/seem more real. If you can't accomplish that, then what's the point? That's something I thought the original did very well, the characters felt real and one of the main reasons I enjoyed it so much.
Same with the original Paranormal Activity, the first one felt real to me while the second one just felt like Hollywood bullshit. Not to compare this with Paranormal Activity, as they are nothing alike, but both succeed in the same areas.
But yeah, I'm not sure where I want this sequel to go...on one hand I want to know what exactly is lurking in the tunnels and on the other, I don't, as that's what made it scary...
Either way, this is definetly one I am looking forward to as long as it is on the same quality level as the first.