Quality of Writing (70%): Pretty broad category, but basically I want my shows to be cohesive and have solid storytelling, characterization, and everything else that makes good writing. When it comes to shows that lack a plotline or final goal, such as many slice-of-life shows, I critique those based on their quality of atmosphere instead of storytelling.
Quality of Production (30%): This category doesn't weigh as much as the previous one on the final rating, but it's important to keep in mind that good anime wouldn't be good anime without, well, good animation. So here I give this rating based on how well it was made for the big screen. This includes prettiness of backgrounds, fluidity of animation, how evocative the soundtrack is, and all other things that enable it to be considered "literature in motion". If an anime doesn't take advantage of the fact that it's a thing to be watched and not a thing to be read, then viewers might as well read a book or something.