I do not understand this as I simply can't stand using 3rd person, but I won't judge you for having a different opinion.
I won't try to change your mind (it matters to me not) but I'll explain what I don't like since you inquired (kind of).
You lose all the cool combat combinations and spin moves. Other features such as the stealth roll are garbage in 1st person (you just seem to propell forward quickly). Stealth roll is really cool for doing ninja flips off rocks.......again lost in 1st person.
Not to mention the immersion breaking RIDICULOUS view of two vertical swords bouncing up and down on the screen (don't even get me started on the "spell hand). I live in 1st person and that is NOT what it looks like.
