I've watched it before. It's pretty interesting, actually. The only complaint that I have is about Ruby and Sapphire.
First off, gems have no gender, which links to their ability to change physical form. They can appear to be male or female by tweaking their appearances. Remember, their physical forms are just an illusion. Ruby can just as easily by a guy.
Sapphire is shown to be a Cyclops, which I don't think is actually possible. All other gems have two eyes, just like the humans. But why does Sapphire have one eye? Ruby seems to have no problem with this, which I find strange. Sapphire also can control the cold...but don't sapphires come from the earth? The farther you go into the ground, the hotter it gets. But then again, sapphires are blue and so can be some types of ice.
Ruby and Sapphire are said that they are "in a relationship." But that doesn't mean they're romantically involved. What if they are related? Most people think that Steven Universe is bad because of the Ruby and Sapphire relationship factor, but I digress.
It is proven in the show that they kiss a lot, but what if that means that Sapphire is sharing "future vision" with Ruby? What if they are telepathically speaking/communicating? There is a lot we don't know.
For the most part, Rebecca Sugar (The creator of Steven Universe) has done a lot of plot twisting, writing, development, and some revealing to the public.
The thing I love most about this show is that the whole show has a meaning behind it...and it is all based on how Rebecca acted around her brother, Steven (yes, Steven), when they were young. That meant Amethyst, Garnet, Ruby, Sapphire, and Pearl were all one person! Steven Universeception!
But in all, I think Steven Universe is a pretty well done show.