I'm letting the finale sink in before I fully comment. I'll say this. It was definitely somewhat predictable and not all that much of a surprise ending, but I think they did it that way on purpose. For many seasons, Walt was able to pull off crazy stunts flawlessly -- from bombing the nursing home, to using magnets to wipe out the computer, to orchestrating hits inside of a jail. When he really puts his mind to it, he coordinates the perfect crimes. As he told skyler, he was "really good at it." So, going into the finale, we all know that walt needs to kill lydia and jack's men -- and that he's extremely motivated to do so after stewing in the new hampshire cabin for all those months. He's had more than enough time for his brilliant mind to plot it out perfectly. That being said, of course he got the job done. Any other outcome would have been silly, in my opinion. Walt is a criminal genius -- and he proved it in the finale as his final crimes went off perfectly.