The acting is decent, but the storyline and the science are laughable. (By the way, huge Sci-Fi fan here.)
Yes, it's important to be able to suspend belief. People who can't do this, can't enjoy Sci-Fi. But for these types of movies to work, they still need to be somewhere in the realm of plausibility, even if only on the fringe. This one is all over the place. It's almost like the writers tried to offend our grasp of reality. My favorite line illustrates this point:
Background: A mysterious vortex hovers over the LA area and shoots lightening bolts that disintegrate whatever they hit. One of the characters (a federal agent) reports to his superior that the vortex is growing larger, fast. He says:
"There's something else you should know sir. I've been running simulations on the vortex's trajectory... Right now, it's about a quarter mile long. But as it continues to move across the state, the vortex will just keep growing. In a few hours, it will be the size of California. A few hours after that, the size of Asia. There's no reason to believe that this phenomenon is isolated to this planet. Eventually, its size will merely expand to infinity. The entire universe will cease to exist... Termination point."
See what I mean? This federal agent--who knows what kind of science background or training he has--predicts that this mysterious vortex, a storm in the sky that no one has ever seen before, will end the universe?? And he jumped to this conclusion because it's a quarter mile long, but it's growing?? Really?? This line made me laugh. And there were more.