Not a bad movie, but not a blockbuster. Too many holes

Rating: 7/10 (29 March 2015)

Summary: I enjoyed watching this movie, which had some decent acting by all. But it was spoiled a bit by some unbelievable paradoxes (in my opinion).
What I liked: I liked the young Voy's acting. She was great. She made her part of the story pretty believable. I enjoyed the fact that there was some attempt to make the science make sense.
The story line was pretty good, but it wasn't clear to me what happened to the earth. Just that people were destroying crops. I'm still not sure what happened.
What I didn't like: I didn't like the amazing "understated" Matthew M's delivery. WAY too understated. I didn't like the guy who played his son.
Spoiler: There was, in my opinion, one glaring error that made me scratch my head. When Cooper was in the black hole and he saw his own ship in the past, this made me wonder if he was moving backwards in time. But it was stated in the movie that time could only move forward. If he went back in time to when he saw the ship in the wormhole, he essentially had gone back 23 years and the earth wouldn't have aged as much as that.
That error alone sort or ruined it for me. And then he was "found" just floating "nearly out of air" just near Saturn - not spiraling down due to gravity.
And if he was just out of air - it couldn't have lasted 23 years. Therefore he had traveled back in time.
I don't get it.