I like Oono, but a Hidaka ending would've been fine with me as well. She deserves something for all the work she put into getting Haruo to pay attention to her.
I wish the author had put more gaming terms in the dialogue (like "I've leveled up in my knowledge of how to have sex!" or "Take this combo attack!"). It would've been typical of a die-hard gamer like Haruo to say such things.
Yeah, translations are indeed a bit rough; I'm still grateful though, just for the fact that some people still took heart into translating HSG doujinshi.