I am not a mecha person. I started watching TTGL to check out what the hype's all about. It turned out to be overrated.
Now, before you bitch at me for saying that, hear me out...
Animation: Although the series was enjoyable, I didn't understand a thing during the fight scenes. All I could remember are lines barging in and out, no image in particular stuck out. Thank goodness for non-action scenes, I get to enjoy absurd drawings of creatures I never though of possible. But because of its unique aspect, I gave it a 6.
Story: One of the good things of this series is the concept. Although the plot was simple, the concept behind it is admirable. I am a biologist so I understood well why the spiral possess so much power.
Music: One word to describe it, "COOL."
Character: Also one of the good things about this series. It showed a good light on stubborness. It simply says "Being stubborn gives you power to succeed."
Enjoyment: The first half did not really struck me. I merely continued watching to know the story. It was in the second half that things started to get exciting.
Overall: This series requires the audience to have a wide perspective on things to make it enjoyable. I asked someone from MAL what was so great about this series because I hardly found it enjoyable at first, now, I believe what made it to the top rank is pure character. All of the categories, story, art, sound and character has an elemental character imbued to it. The animation has a personal character distinct to TTGL, along with the music which was way cool and the concept of the story which was extraordinary.