I saw the movie and I would say JJ Abrams did a good job directing it. I'm not going into details about Tom's acting, but I think he played okay. I'm still loving the first Mission Impossible with Brian De Palma, though.
The effects were great and it's soooo Lost.
Though, I don't really like movies that delve more on the love story so I dunno.
I like the film to sum it all.