I like all three of them, even the forced 3e person.
The reason why I like the forced 3e person is because I pretty much never see my character any time else in 3e person, and by so missing good scenes where I can see my character in his armour and with the looks I gave him during character creation. So in short, it gives customisation a meaningful depth.
Also, is the 4e poll necessary? everyone with good thoughts about his fellow man would like it to be optional.
you can switch into 3rd person view by pressing a button, so no need to make the finishing-moves into something which sux (forceing into 3rd person view)
I'm sure that the slow motion and 3rd person will be an optional thing because in the Fallout games you could turn off slow mo and kill cams in the options menu so hopefully that will get rid of that or that put it in an update
the finishing move shouldn't be something which apears by every kill, because the mostly people will disable it by mod or options after 10 hours playing. finsihing moves should come only by 5-10% kills.