My problem is, Keima's feelings being a total black box, i just didn't see what made him develop feelings for Chihiro, ever since the time Keima cried at the school festival. Considering other characters got more development in the end, the choice looks even less relatable (although, i haven't decided what i'd consider a best choice, myself).
That, and an axed ending (i totally expected Kaori to make a return and Elsie being a super weapon was just hand-waved; Urara arc was kinda out of place, but i wouldn't have hated to see her again, too).