Sunshine isn't something to be marveled by it's plotting and characters nor even the acting, it's all vague and even kinda stupid at times. What is great about this movie is the premise of Sun being on the edge of shutting down, thus killing all the life on Earth, and people trying to re-ignite it with a nuclear weapon. A good idea and highly entertaining. As expected, everything goes terribly wrong and here we go again.
The movies's visuals and sound effects are something else though. They exceed the regular scifi movie level, and Sunshine is beautiful to look at. If you can't appreciate this, you'll certainly be bored and confused. Otherwise it's an experience you probably won't regret.