Some of the FE sims were more complete than others, but NONE of them accurately replicate a 737, certainly not where the flight model is concerned. No wonder Mr Pero, in the link above, chooses his words so carefully. Size and layout are about the only similarities to the real thing. That, and the seats. I spent a lot of time instructing in the Wellington one (which seems to have disappeared), and just about the only thing that worked on the overhead was the light switch. The PFDs are generic, as are the FMCs. The thrust levers kept bending, a lot of the hardware was shoddy and the visuals... well... pretty grim.
It's not a bad entertainment tool for those who don't know any better, but not so good for actual pilots (once the "wow it's a jet" thing wears off, anyway).
I think the proof of the pudding is how many have closed shop...