Very Entertaining - Bad Time Line Reasoning

Rating: 7/10 (17 March 2015)

I really enjoyed the film.
What I didn't like, which it a complaint that I have with many Sci- Fi movies/series, is that the time lines don't make sense.
I'm not talking about the time they loose going to the planets, or getting close to the black hole, those are scientifically accurate and I was rather impressed that they were actually in the movie.
The humans from the future couldn't have built the time cube (that's what I am calling it) or the wormhole to get the past humans into the future because the humans in the future would never be in the future to being with.
Even if I try explaining it to myself assuming that we originally found another way to survive into the future without the worm hole and then had advanced enough to build such devices... why would we ever take the risk of altering the past of such a successful civilization?
Overall, this movie is extremely entertaining, and I would recommend watching it.