@ ResistanceKnight:
Some good points. Also, about Invisibility, I want that spell back into the game. Chameleon will let you stay masked, while Invisibility has a 100% effect but it's gone the moment you're attacking something or casting a spell. That way, it's a great spell that can be used by enemies to surprise you and then get visible. The more constant Chameleon effect has already been seen in Oblivion to great effect - although randomly and therefore not specifically utilized as a defining gameplay feature. Which is too bad.
In Fear, those invisible ninja things scared the crap out of me. Oh my god, really, first time I saw them I walked into an office room on my left, and in the corner where two walls met the ceiling, it became visible for only an instant. It was one of those things that I wasn't sure I saw, because the lighting in the office building was so poor. I couldn't tell. And even better was that their invisiblity was really invisible. The only way to really make out their outline was to slow down time when they were moving, otherwise it was really hard to see. But anyway, back to my story. The thing flickered in and out of visibility right away, so I froze. I was playing with my little bro watching, and I was like "Hey, did you see th-" And then it reapeared right in my face getting ready to attack me.
Jumped a solid foot off my bed. Scared the crap out of me. And then I killed it, with a shotgun for good measure...but the sound gave away my spot, so like four more of the things came running. I huttled in a corner because I was so scared of the things.
Anyway, a good scare will trigger a natural survival instinct in the brain. When those invisible ninja things attacked, I needed my little bro to tell me to use my slow down time feature to combat the things. I completely forgot about it, because I was just trying to get away and blast the things. Because my bro wasn't playing, he was able to calm down faster and remember I could even do that. If they can get me to forget about my dragon shouts for even just 30 seconds, they did a good job in creating a scary game moment.