Oh man, just saw it tonight with a few friends, and we loved it! We went to an early showing tho, so it was Junior-High night out sadly, so the whole goddamn theater was fully of chatty whiny 16-yr-olds... I think my 3 friends and I were the only people in the theater to like it tho... but we discussed what had happened and what we thought the whole way home, and really thoroughly enjoyed it.
As for shakey-cam concerns, I've never seen Blair-Witch, so I cannot compare, but there weren't too many fast moving camera scenes in this, altho there were some looking-at-feet while moving parts, so I guess it is probably enough to be a concern... I've never gotten motion-sick in my life tho, so again, I cannot really compare...