First I would like to say that I'm goingt to miss mike a lot, he was a great character and I was sad to see him go last night.
Am I one of the few who doesn't hate Walter? With everyone he has killed I still find no fault with him doing it (okay maybe not Mike).
The two guys from the first episode, killed out of self preservation.
Jane, glad she's dead, money hungry and corrupting Jesse with worse drug habits then he had. At first meeting Walt used Jesse as a way into the meth market, then as the show progressed you could see that Walter looked at Jesse as a son. He saw Jane as trouble especially after their interaction regarding the money and when he saw he choking to death, knew it would be better for Jesse in the long run.
Gale, Walt didn't kill him but gave Jesse the go ahead to, again self preservation.
Gus, loved the character,hated to see him die. Killed off for self preservation as well as for power.
I enjoy seeing just how far Walt can Break Bad, my one hope is that he kills Skyler off, she is such an annoyance at this point.