Well, my biggest issue with Hitomi is that the 24 hour time limit was pretty brutal. If Hitomi had given Sayaka a few days, at least, I'd have
much less issue with it.
Secondly, the
whole way Hitomi laid out the news and the 24 hour time limit seemed kind of cruel to me. Hitomi's tone and demeanor struck me as pretty hash the entire Hitomi/Sayaka scene. In fact, it was so harsh that I honestly had a theory that Hitomi was a secret agent of Kyubey who he was using to screw things up badly for Sayaka and Madoka, trying to force Madoka to make a wish with him.
This wasn't a good scene for Hitomi. But in fairness, pretty much every girl in this show had at least one scene where they came off badly (yes, even Madoka - re-watch Episode 8, and there's a scene that might stand out to you here).
Aside from this one scene, I liked Hitomi well-enough.