It was the show that started it all. There are some excellent stories as well, although some of the writing does show its age. FX can be upgraded, but outdated attitudes are another matter.
Of course, the argument could be made that if you go through life applying current attitudes to something written almost 50 years ago, you will ALWAYS be dissapointed, and therefore angry, and never enjoy anything.
This is why you should simply enjoy things for what they are, and let it go at that.
Now, to answer the thread question: It's Star Trek, and I don't care how old it is. I loved it as a kid, I love it now, and I will love it in the future.