Terra Nova is freaking garbage
They actually had a few interesting ideas but completely botched the writing IMO.
Instead of that they should have made a series of The Many Colored Land by Julian May - Same basic premise but in this case in the far future a bunch of square peg humans go through a one way portal to the Pliocene and when they get there are surprised to find that warring aliens are living there. If Hbo did a series of this it would be the best show they ever did - it would really put GOT to shame.
[VIDEO]http://www.amazon.com/MANY-COLORED-Pliocene-Exile-ebook/dp/B00633YOUU/ref=sr_1_1?ie=UTF8&qid=1343047457&sr=8-1&keywords=julian+may]MANY COLORED LAND (The Saga of Pliocene Exile): Julian May: Amazon.com: Kindle Store[/VIDEO]
I am more than content to just read a book instead - TV doesn't treat sci fi very well at all. Mostly half-assed trope re-hashing and cram as much effects in as the budget will allow.
That being said I do enjoy Warehouse 13 - not really sci fi but the characters are good and and it is pretty funny/entertaining.