It's probably very quirky of me, but I like the slide-to-answer feature, and I like holding it in one hand and being able to type without watching.
I basically like my N86 because it allows for one-handed operation without looking at it - I can even fast-dial some numbers just pressing the .
I also like the physical camera button A LOT, if high end Nokias come with Android and camera buttons, I might consider them for that alone :)
TL-DR I love physical buttons.
I also don't use predictive text - I should get to the 21st century someday :) , but I switch languages and contexts too often and it gets in the way.