I just watched Karthi starrer Japan, and I have to say - "It's boring" - it could've been a good script but it failed as a movie. Wasted opportunity by the director.
First half is an utter waste - felt like walking out of the theatre, and second half was decent, and it actually had a good ending to the story.
GVPK'S music fails to deliver goosebumps. Just a lame loud bass sound doesn't make a good bgm!
Coming to the acting, Karthi has done a good job, but the poor writing cannot be saved by Karthi's nice acting. Then there are these ridiculous fight scenes (especially that one scene after his intro;-)
There are plot twists. Some predictable, and some unpredictable. Still, that doesn't impress. The film has unnecessary violence and the fights happen too late (the hero talks for a while before a fight and we keep waiting for the dialogues to end and the fight to start)
Climax was good. That's all there is to this film.