Of all the 737 simulators I flew, none of them were anyway like the real aircraft.
Have seen some dreadful boxes and some good. My initial 737 endorsement used -300/-400 sims at Qantas .. first flight in anger and I couldn't tell the difference .. other than it was much more fun and the visuals were just so much better.
Probably just a reflection on my abilities, I guess.
Surely, the need is for the sim only to be reasonably good so that the transition to the real thing is relatively painless. (Thinks back to the earlier 727 sims which were pretty dreadful).