1st movie.  He's a normal human.  He gets shot in the chest 6 times and walks away from it.  I can suspend my disbelief by thinking that he was turned into swiss cheese without hitting anything instakill.

2nd movie.  He gets shot point blank in BOTH eyes (you brain is behind there btw) and is burned to a crisp.

3rd movie.  The ending from the second movie was legit.  He's gone.  On to a new Halloween story.  Weird as shit, but ok.  First one is about a guy who escapes a mental asylum and kills people.  Second one is about the same guy on the same night continuing his quest.  3rd one is about some evil mask makers who steal a rock from Stonehenge and ship it to their mask factory in California where they are putting fragments of the stone into cheap halloween masks so that when children hear a remix of "London Bridge Is Falling Down" at a specific time on Halloween, it will kill them, snakes and crickets will come out of their head, and the carnage will unleash Samhain.  Mkay.  And:

4th movie.  Michael's back because for some reason, that attempt at a story for #3 didn't jive with a lot of people.  Wonder why?  So he's not explained to be a zombie.  I guess he received new skin and the bullet hole wounds in his eyes healed while Conal Cochran was trying to kill people with masks and the sherrif was chancing statutory rape charges.

Next 3:  the writing and casting, man.  Fun to watch, but WTF am I watching?

H20: Stupid, but fun.

Last one in that series: Busta Rhymes, yo.  He poked Michael in the face and swore at him and lived.  That takes skill.

Zombie Remakes: Nope.