Why Flash is the Most Overpowered Superhero

To start off, I should mention I'm not big into comic books and have never really read any to begin with. I have however always liked the flash, the power of super speed always seemed really cool to me. But I never especially got into the Flash until the show about Flash, unsurprisingly called, "the Flash", came out. As soon as it came out I was hooked, that made me want to know more about the Flash as a character. I came upon a whole bunch of things talking about Flash and it became pretty clear that as a superhero, he was pretty overpowered.
When many people think of the most overpowered hero they would think along the lines of superman or something around there. But really the Flash is the most powerful. In the comics, the Flash can literally go as fast as he wants. By as fast as he wants, I pretty much mean it literally. An example of the Flash going impossibly fast comes with his race against aliens that mastered teleportation. In he end he won the race using the speed force to allow him to go so fast that there is not a word for how fast he went. With a superhero that can go this fast, nothing can stop him, because nothing can go fast enough to touch him. So, in the end, the Flash is the most overpowered superhero.
There's a really interesting video about how fast the Flash can actually go, delving into many examples of his use of his powers. The video is here and I recommend anyone a little interested to watch this 8 minute video.