Well, I started watching CSI Las Vegas. A little bit too late, as the fifth season was airing, and I just started to watch season 1. The first episode obviously. I loved it from the start. I have no idea, but I thought it was brilliant and interesting. So I decided to follow it, and watch the other seasons after that.
When I have watched 3 or 4 seasons (I can't remember), I started to watch CSI Miami. The first 5 episodes from season 1. Somehow, I did dislike it. I just don't think it's as good as CSI Las Vegas, and I really dislike David Caruso/Horatio Caine. He drives me insane. He's just plain annoying. So I planned to just continue watch CSI Las Vegas and ignore CSI Miami, and never watch New York.
Later, I got the first 2 seasons of CSI NY on DVD. My mum bought it for me as a gift. I never really wanted to watch it, but I gave it a chance one evening when I was really bored. Hated the first episode, but decided to give it another chance. I was soon hooked, and loved it.
Now, I only follow CSI New York, and never miss any episode. CSI Las Vegas sadly lost some characters who I really liked. Like Warrick and Grissom. The show is crap noawadays, but I guess I miss them way too much. And I don't really like Ray Langston. I still watch some episodes sometimes, but the show is not as good as it used to be.