I love 28 days late, 28 weeks later not so much.
However, they are not zombie films, they are infected/epademic movies.
I am legend is also a fantastic film but again it isn't a zombie movie, I agree with PPs that they are a type of vampire like creature.
The [Rec] films a some of my favourite, one and two and brilliant, three is less so, it's not really related to the other films (completely separate cast and story).
The fourth film goes back to the original story so is better but not as good as 1 & 2.
Z nation season one was very good, season 2 was verging on stupid, although it's more what I expected from the makers of sharknado.
Resident evil is one of my favourite films, 2 isjust as good IMO, three is nearly as good (although I am still unhappy with what they did to Carlos!) four was generally a good film, but not quite up to the level of the franchise, I was less impressed with 5.
I greatly dislike their inability to explain what has happened to previous characters.
I am still looking forward to The final chapter though.
IMO Romero's 'Dead films are classics.
I am a huge zombie movie buff. 