If you're in the mood to be seriously effing creeped out, rent SPLICE.
I'm considering ending the review right there. But I won't.
The first 2/3 of this movie was great. It fed the sci-fi nerd in me with high concept and *gasp* actual scientists carrying out actual lab experiments. This is something that could potentially happen in our world, which made it kinda scary.
Note: THIS IS NOT A HORROR MOVIE. It's just effing creepy. There is no other way to put.
It's basically human DNA experimentation gone wrong. In a HUGE way. This is the kind of sci-fi I love, but unfortunately, it's also the type that screenwriters can easily ruin.
The female MC, Elsa, really pissed me off. If I knew her in real life, I'd probably knock some serious sense into her with a good one-two punch (don't judge me on that until you've seen the movie). Her partner, both in the lab and in life, Clive, had a bit more logic in him... until he decided to **** *** ***** in the ****. (I had to asterisk it; major spoiler in there).
Like I said, the first 2/3... brilliant. Then we get to Act Three and the whole thing went more sour than a jug of milk left in the sun all day. There's a reason why you have to be at least 18 to rent this movie. There's also a reason why it was only in theaters for, like, two minutes?
Overall, I'm giving it three stars, mainly for creative concept and some awesome CG effects. But the characters were thoroughly unlikable and the story could have had a much better ending.
Worth renting? Maybe, if only to satisfy your curiosity. I probably won't ever watch it again, though, even for free on television.