Ive flown Monarch a few times. Recently to Spain and they were great. My FIL uses them very regularly to travel to Europe and rates them as one of the best airlines to travel with.
We flew back from Orlando with them once, years ago and that was a nightmare. It was a tiny plane that had to stop for fuel in Bangor, Maine. There was a smoking section on the plane that meant the whole cabin was filled with smoke. Seatback TVs were probably not invented then!! There was a nasty incident of "air rage" as well when there was a kick boxing fight between two passengers on take off...the pilot had to come and seperate them, as all the cabin crew were female!!
On the plus side...this was nearly 10 years ago, so Im sure things have improved!! The cabin crew were fantastic and even the food was good! Im sure they have bigger planes these days for the transatlantic routes...I dont think any of the tour operators do the stopovers anymore!
Im sure someone wil have a more recent review of Monarchs Orlando route.
Allie