Powerful Ending; here's why (spoilers!!)

i've been reading people complaining about the ending on this thread, and i also can feel it when i watch it in movie theatre people go "what?!" on the ending. but it the best ending possible and the ending is what's the movie all bout.
i'll make it short.
Locke life unfold right before us as we accompany his 90 minutes drive to London, to see his baby from a one night stand with Bethan, all his problem, with his wife, family, boss, father, job etc is root in his decision to just go see the baby. in his journey, we question his decision, why throw away everything, basicly his perfect life, his family and his high profile job, just to see this baby from a mistake he make in one night. we all make up an alternative for him as we ride with him, but in the end when we heard the baby crying on the phone, we know, we just know he make a right decision, the baby has nothing to do, and has no mistake or whatsoever, the baby innocence remind us that Locke make a right decision all the way. this is why i think this is a powerful story, and masterful scriptwriting.