I agree. The problem with this whole thing is that Grey's Anatomy is supposed to be realistic (not defying the laws of nature in the real world).

Yes, the doctors rotating beds might be exaggerated but it could happen. And yes, the trauma cases seem a bit too sensational for reality (especially in the context of every episode has a great trauma case when reality might say that real doctors see it once or twice in their careers). But it could still happen.

The ghost sex is unrealistic. I could handle Izzy seeing Denny pass through the halls (because that is showing that she misses him greatly) but when she started interacting with him, the writers started on a slippery supernatural/sci-fi slope.

I like sci-fi but at least the premise has been set up from the beginning. For example, Star Trek is set in the future, so having spaceships and aliens shouldn't be a surprise. Lost established itself of going into strange phenomena by introducing the polar bear in the first episode and having Locke walk while on the island.

Three is the perfect number.