I'll add another semi informed opinion: I believe if you have an instrument rating you can log approaches in MS Flight Sim ( and probaby others by now) to meet the requirement for instrument currency, nothing more. It will always be logged as sim, no matter how realistic, if it isn't in a real plane. I fly a level D full motion sim (about as realistic as the airlines get) for airline recurrent and training. It is always logged as sim. I do not believe you can log PC based sim time for the purpose of getting a rating or license. You can, however, get your type rating in a level D sim without ever flying the real plane. Your first flight in the aircraft will be with payiing passengers.
BTW: In our company sim we can load up a CV. I have landed a MD 80 on a CV. Funny story: The instructor, non Navy, kept telling me to "line up". I had pefect line up and the ball centered. He kept saying we would not make it. Sure enough I boltered. She flew away real nice. In the pattern returning I figured out what he wanted. Of course we had no tailhook. The sim would not simulated a trap anyway. He wanted me to take the entire deck run, not the angle. So, I planted her on about the two wire and went into full revese and max braking. I aimed for the bow. We rolled past the island but came to a stop on the deck. Keep in mind the gross weight was set for only about 110,000 lbs and the instructor gave me 40 knots accross the deck. Still, it was a blast from the past.
Sorry for the sea story.