Finished Season 1 of the Anime... is it worth going on? I just finished the first 12 episodes... and I've read that Season 2 (Root A) is... weird to say the least.

Can anybody explain that in slightly more detail. I know some people explain it as a "What If" scenario. Is it basically the anime making up a bunch of crap so that it could have a "complete" series with an ending? (similar to what perhaps Gantz and Claymore did in their final arcs before their respective series ended.) I know that it differs GREATLY from the Manga, but beyond that I don't know much.

On a similar note... as a viewer, it felt as if episode 10 - 12 abruptly happen, I can only assume there's more that occurs between episode 9 and then the climax arc of episode 10 in the manga, because that certainly seemed as if there was a lot of stuff going on that I was supposed to care about but didn't fully grasp due to the lack of context.