My younger brother came back from seeing it with friends this afternoon. He says that it wasn't anything amazing, but it's worth seeing if you're a fan of the Predator movies.
Ignore what Laurence Fishburne's character says and it's a pretty credible Predator movie, especially when taken as a direct followup to Predator. There are a few ridiculous bits (one character swordfights a Predator; not one but four Predators bite it over the course of the film), but overall I thought it was fun. Not a masterpiece of cinema, and there's one plot twist that's kind of lame, but if you liked Predator, you'll like Predators.
Outside looks so damn awesome right now. There are clouds covering most of the sky, but closer to the horizon, it gets lighter and lighter until the blue appears. The sun is setting so that everything is cast in a yellowish glow, and the trees, the houses, and the streets are slightly illuminated. And a light rain is falling.