Cause don't be fooled, Titan isn't some masterpiece of storywriting. This can often be well hidden under the massive production, but the mediocrity is there. As an experiment, try this: watch Titan, and skip all the action scenes. You'll realize three things :
1. You're bored out of your mind
2. You don't know what the hell is going on
3. You still watched 90% of the show in spite of skipping those scenes
Indeed, in between the action scenes, you will be treated to a huge cast of unmemorable characters sitting around talking, for the most part. And you will have no clue what they're talking about. This is because Titan tries its hardest to be as "mysterious" as possible. As a result, characters are tip-toeing around story elements constantly while they are conversing to avoid revealing anything. It's alarming to realize nothing concrete ever gets said. These conversations are a pure waste of time: they are not entertaining, they don't reveal anything, they don't clear anything up, and they sure as hell don't feel natural. Look, I can understand that after using half of the 2018 Olympics budget on the action scenes, that there is no money left for the rest of the show (or for the ladies' javelin competition). But that's not an excuse; just make a 2 hour movie and don't feed me all this obvious filler. Titan ends up being a very frustrating watch most of the time (stop with the damn flashbacks, please god). And after all these hinted-at plot points, you can just feel like it isn't really going anywhere, or that it'll take 20 years to get there.
Fortunately, it doesn't matter that much that most of the show is filler. The action scenes are usually such concentrated awesome, that the show delivers, over the course of its duration, more entertainment than a great number of animes. The animation is unparalleled, the soundtrack is powerful and high-energy, and the characters are intense and emotional. Sometimes i found myself cheering like a kid over a few great moments. It really shows what you can achieve if you aren't afraid of selling half of your country's gold reserves to do it.
Titan's a show that you can't NOT watch. One because the animation is just that good, and two because tens of thousands of people have had their welfare cut off to produce this anime. Don't let their sacrifice be in vain. Just don't expect a masterpiece. 10 for the action, 4 for the rest, so 7 on average.
