The ED before and after this one are better, imo.
The ED to Gundam Unicorn is alright, not the best I've heard but alright. The anime itself though, it was boring in some parts. I like Gundam IBO a lot more.
That's really awful to hear
It's studio Pierrot they're know for that, and the low quality animation (that's what people say). I almost never notice though, but when I do it's someone's face not properly drawn or there's no shadows where there needs to be.