http://www.rottentomatoes.com/m/after_earth/
Basically, this is Smith and his real-life son, Jaden (both affecting ridiculous mid-Atlantic accents) talking the audience to death for something like 90 minutes before the closing credits.
Top Critic
Lou Lumenick
New York Post
Jaden is fine at running, jumping, fearful trembling, and affecting steely resolution. He doesn't yet have his father's charisma; perhaps to help him out, dad opted not to bring that charisma to the set.
Top Critic
Alan Scherstuhl
Village Voice
Bits of the plot, including the environmental science of the new Earth, make no sense. The dialogue is leaden. And the special effects are surprisingly unconvincing.
Top Critic
Charlie McCollum
San Jose Mercury News