i started watching code geass to look for its mecha contents. but as the ep progresses, the story doesnt even bother to explain in details wat kind of robots they use, weapons, or how they power up insanely. geass, the power lelouch (main character) conceived, is where the story centers as to how and what purpose he uses it.
there are many plot twists that you may have never seen in other shows, which adds more to its excitement and might make you say wtf. its fast pace makes almost every episode satisfying to watch without worrying for the next ep (i watched it weekly when it was airing). the enjoyment of this show also comes from lelouch's and his opponents' clever/devious schemes to defeat each other. c.geass may seem like a light anime, but lelouch's twisted personality (like yagami from desu note) and a series of unfortunate events give this anime a darker look than how the animation (the tsubasa chronicles look) suggests.
overall, this anime is prolly one of the best show i've watched. i mean, i couldnt even careless about the mecha shit. although, sometimes the mecha stuff just dont make sense anymore. if your an animehead like me and you havent seen it, then youre missin out.
give this anime 9.5/10
not a 10/10, bcos there are some fan-service contents that at times ruins its moments.