Personally loved it. Story isn't mind blowing but the movie itself is quite realistic. I've seen better robot movement in other movies but its not bad. Its not Avenger quality movie but i still think you should watch it. I gave it 7/10.
2h of raw killing. If putting knife into eye is too much for you consider if you wanna see this movie. You need to watch the previous one to understand what going on it this one.
OVA doesn't contain anything special just some fun filler material. Anyway it was 'cute' to watch and made my day a bit better. If you have seen the original Eromanga Sensei go ahead and give this a watch after it if you have some extra time to spend. You don't miss anything if you don't watch the OVA... maybe some lewds but yeeeaaahhh....
Movie was interesting but it felt more like long episode from some series more than a movie. The ending made it feel so. Kinda mediocre for movie. Nothing special happened. I cant recommend this movie to anyone.