One of the greatest feelings FO3 gave me was fear. I will never forget the first play through of the game, and one of the best reasons for this was the Deathclaw.
I'm sure most of you reading this remembers fondly those growing footsteps behind you, ambushed by the predator who could easily turn you into coleslaw.
Yet, in this game, that's all gone. Why? Because every damn one of them roars before they attack. I've yet to be completely surprised by a Deathclaw (except for the one I found as I went around a building and literally ran into it - shot dead before it finished roaring).
I miss the sneaking they used to do. I miss the footsteps knowing one was coming.
All ruined because ROOOOOOAR.