I saw the first two episodes and so far I must say that while I look forward to more episodes I am not overwhelmed. As most everyone else has said, suddenly the whole world doesn't know that there are anomalies all over the place. That bothers me but you have to get past it and move on.
The plot is very familiar.
Missing things: Connor and Abby. OK, they were cute. In two episodes, they had no hint of this with anyone.
Rex. So far, everything brought through is gigantic and eats people. For every gigantic creature in a real world ecosystem there should be thousands of small ones.
Nick Cutter. There is no wise man who has a clue. They're all kids.
Common sense. By the second episode, they should darn well know that they could be going after very, very large creatures. They should equip themselves appropriately or at least make a very visible effort to do so. If you're going after a predator the mass of an elephant, bring an elephant rifle or better yet something in .50 BMG. Did they? Not in the second episode.
I hope that they will wise up and produce something as durable as Sanctuary or Primeval. Let's see if they do it.