I am watching Star Trek: Deep Space 9 at the moment. I never bothered watching it before, something which I cant understand anymore.
Ok, now start laughing, how 90s I am.
But seriously. I would refer to myself as someone who was interested in Star Trek and SciFi before and becoming a Star Trek fan during the last year. I started watching Star Trek, when I was about 7-8 years and and Voyager started. Didnt knew about it before. But my brother, who is much older than me, was hyped at that time about the start of a new ST series, so I thought it must be cool, like everything your older brother does, when you are at that age. Soon I got into it and became a fan of Voyager. That time I learned, that there where also other Star Trek series, but couldnt understand, what was so interesting about them. So except for maybe 2 or 3 episodes of DS9 and sporadically some Episode of TNG, I never watched any other Star Trek and besides that, I started watching Stargate and became a real big Stargate fan (Ok, now you can continue laughing at me), so Star Trek didnt bother me at all form that time, except for Voyager, as it is a part of my childhood and early youth.
During the last years I have met and talked to some people about ST, who really wanted to convince me, that DS9 is the best ST series, I started to think about it and decided to watch them all, from the beginning to the end, which is really necessary in DS9.
Now, that I am nearly finished (last episode of season 6 left and full season 7, so dont spoil me
), I really have to say, It IS worth watching it. It is the best ST series. It features everything, a long term character development, lots of different characters, a plot, which really lasts from the first to the last episode, a lot of funny moments (Quark vs Odo!), it is about love, war, politics, religion, terrorism and shows a very differentiated view on the world of star trek. But the most important thing is, not everything and every problem is solved in one episode, nor everything is solved in an ethical "federational" way, there are just some things, which are basicly unsolveable, which makes it much more believable, than everything before.
But to make a plot like this possible, the series has to start very slowly and needs really a lot of episodes. The plot begins with all the problems following the Cardassian-Federational War and the occupation of Bajor, and slowly develops into another war with a new enemy, the dominion, which is established real slowly, yet very believable. During the story, there are hopes for peace, set-backs and all such things.
All in all, I like it really much. So if you consider yourself as atleast a little interested in Star Trek and have never watched DS9, you should give it a try, but it really takes its time its 178 episodes.