Guys, it's one thing to hate on the teaser, but if you just don't get why they showed what they showed, then here's how (I believe) it breaks down:
The idea of the teaser what was to surprise and to provoke questions. It focuses on the realistic, gritty, yet beautiful look and feel of the world this Superman will inhabit which is unlike anything we've seen in a Superman film. It focuses specifically on the Deadliest Catch moments because we're going to be seeing formative periods of Clark's life that have never been depicted. And the entirety of the trailer is kept vague and non-linear because when the flight scene happens, you're supposed to be surprised that it's a Superman movie and you're left to wonder, "Why is he on a fishing boat? Superman has a beard? Damn they're taking a realistic approach to Superman..." And the flight scene is the tiniest taste of the special effects to come. Bottom line, the teaser makes the statement that the movie isn't just going to be an effects orgy, that they're trying inject some humanity into Superman, which I don't think is a bad thing.