I give this anime eight out of ten purely for my love of the characters. I've been a fan of anime for four years now, and this is my absolute favorite. However, I have to be honest: It's not the best.
If you want to see an anime for pure animation, go see Suzumiya Haruhi or Mai-HiME. The animation for this series is about as bad as that of Sailor Moon. It's sketchy, and there are many places where the budget runs out. The animators constantly change, and you can tell. I've seen the whole series twice and own it on DVD, so I know. In fact, I'm watching it now. The English dub is awful. Probably the best voice actor in the whole series is Bridgett Hoffman, the voice of Fuu. In close second, I'd put Terry Roberts, the first season voice of Ferio.
Now, don't get me wrong, there are some really great things about this series. The characters are absolutely wonderful. Almost anyone can feel a closeness to a character in this series. For me, it's Fuu Hououji, for another, it's Umi Ryuuzaki. For another, it's Lafarga. There's someone you can love in this show. The characters are always changing and you see more and more of them. The plot is full of action, adventure, fantasy, mind games, romance and a strange twist at the end.
There's not more I can say about Magic Knights, other than I think everyone should watch it. That's about all