From The Movie Snob:

Beyond the Sea (B-). A Kevin Spacey film about the life of 60's pop star Bobby Darin. Darin, probably best known for singing the hits "Splish Splash" and "Mack the Knife," is portrayed as a young man consumed by ambition to be the biggest star in America -- bigger than Sinatra. An episode of rheumatic fever as a child left him with a weak heart, and he knew he would not live a full life. And during his short life, he did indeed make hit records, win grammies, get nominated for an Oscar, and marry another 60's star, Sandra Dee. For all that, though, his life seems to have been relatively uneventful (for a celebrity), and the movie is interesting without ever really catching fire. Not bad, but definitely not great.