MC, it's not that I dislike Kreacher (and actually I liked him a lot after he warmed up to Potter), it's that I just like Flitwick more! To me he's not one of those background professors like Hooch or Sprout that gets less focus than whatever subject they're teaching. While it's true he's not in-your-face at all times like Snape, he's not quite as invisible as the aforementioned duo. I'd say he's right in between Madame Pomfrey and Professor Trelawney in screentime so to speak.
My like of Flitwick mostly comes down to sentimental value. He taught Harry, Ron, and Hermy their first life-saving spell - Wingardium Leviosa, is regarded among Hogwarts as one of the best professors, and he is Head of my favorite House. Not to mention he's an adorable little old guy with his tiny stature and his squeaky voice. So yeah, just a bad draw all around for Kreacher.
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I've come to the realization that I need a sig.