I'm the biggest football fan, and I wasn't either, but this anime made my childhood better when it was broadcast.
Short Story: The characters want to become the best and strongest. Season 1: it takes place normally, there are matches between schools. the following episodes are a little more strange because "aliens" appear. In the end, everyone unites to be the best in the world (the best in Japan). The following seasons: new characters appear "the next raimon 11". Those from the first season grow up and become coaches who "fight among themselves" to get football back because it becomes "controlled".
Sound: I actually love the sound, the opening , especially the opening is brilliant, I could listen to it during the anime as well
Characters: at the beginning they are a bit weaker but along the way they become stronger, you learn different things about them and especially about family members
Enjoyment: the anime becomes more interesting after a certain number of episodes, it's the same as with any anime, it shows you how it starts (for example here how a team is formed) and along the way it becomes more intense to watch, you start to find out/discover "the mysteries"