I don't really know what you mean. Every series has its flaws, even some of the best. For example: Gode Geass-- their little lips and gangly bodies can sometimes be waaay too noticeable to be cool
. xxxHolic: Their legs can be too long at points. And so on. Every series has its flaws.
As for this series... it has its moments. But honestly, it just looks like a game. I don't know what you're seeing that I'm not, but I really don't think it has that bad of an animation as you make it out to be.
There are many series that have worse animation, and all you have to do is search. Most will be the older series. For me it's DBZ. I don't have any dislike against the story or plot, because I've never seen it, but I've always questioned why people liked it because of that horrid animation
. Just my opinion.
Although this isn't a thread to be dissing other series, I find it necessary to point out other horribly animated anime in order to defend Angel Beats, because I'm definitely not seeing what you're seeing, and I'm gonna need to see some screen caps soon to know what you mean xD