There are many great mecha anime, as it is one of the oldest subgenres in anime, but its history also means that there is a great variety within the subgenre. As might be obvious, many of these are nowhere near scientifically accurate, but they don't let realism get in the way of telling a good story.
10 Least Scientifically Accurate Mecha Anime (That Are Still Great)
Some of the best mecha anime embrace their outlandish and unscientifically accurate nature, letting the storytelling take center stage.