My only major criticism - it takes too long for the series to get going. I was at least 7 episodes in before I felt motivated enough to continue watching. The ending was left open to interpretation - here is my take.
Oreki says that he'll run the business side of things for Chitanda. She doesn't hear him clearly and asks him to repeat what he just said. Embarrassed, he says it was nothing. She then says, "No, it's only April." Here is the thing. If she didn't hear him, she wouldn't have said anything about it being April b/c regardless about that statement being true, that isn't relevant to the conversation. I honestly think she did hear him and by saying "No, it's only April" she is in her own way accepting his form of dedication/commitment to her. He's not confident enough (nor assertive) to ask her out directly. But I can almost guarantee that if she held his hand and asked him what he said the first time, he might've gotten a little braver. He seems particularly susceptible to touch it breaks down barriers for him. And especially since no one else was around, he may have been more inclined to do something. I still wish that it ended with him finally making that verbal commitment and Chitanda giving him some sort of substantial reward, like a kiss on the cheek or something. She has to initiate b/c he simply won't.