A lot of people are saying that Eromanga sensei is a copy-paste of Oreimo, and there is a nugget of truth to it, however the similarities lie at the character choices; a little sister with an unconventional hobby, a big brother who wants to deepen his relationship with his sister which is ultimately taken to an incestuous level (though she's not related by blood guys!), token rival loli, and apparently neglectful parents.
Story: 5
It's nothing special. LN author is trying to make it big, and unbeknownst to him his illustrator is his sister. But he only finds out by chance when he watches one of her streams and she finishes it by almost giving her fans a strip show because she forgot to turn the webcam off. Comedy gold! Did I mention she's 12?
Art: 10
The art doesn't disappoint. Characters are very rarely, if at all, disproportionate or drawn awkwardly. The colour pallet works well. I really like that they use actual unfinished sketches and timelapses of sketches in progress for the sister.
Characters: 6
As of episode 4 we only have three actual characters who have extended screen time so this is subject to change, but I can't see the characters getting any deeper than the typical tropes. The interaction between the brother and his stepsister is kinda cringe at times.
It's definitely watchable but it's not going to win any awards. If you want a bit of light watching then by all means, go ahead. Just don't take it too seriously.
