2) How you react under pressure ie: do you quickly and accidentally pull the wrong prop in an engine failure just after rotation?
3) how methodical you are in your cockpit management
4) that you are not a total douchebag in the cockpit
You'll find that the sim will be ready, with engines started, flaps at a take off setting, trim set and you'll be sitting on the button ready to go. You'll be given a briefing before you go in and it will most usually consist of the exercise you'll be expected to follow. Which should typically consist of:
A normal takeoff, and clean up, followed by a visual circuit with a go around with an engine failure/fire/severe damage. (All in CAVOK weather) The QRH memory items/drills will be ably handled/coached (remember you have no time on type) and completed by the other pilot, and you are now expected to show a level of handling skills, with a pretty big emphasis placed on your HFCRM skills. Can you manage the event? What are your management skills like? (Aviate Navigate Communicate) You will allowed (in most places) to use your own company SOP to complete the procedure. You will be assessed on your flying skills, your ability to use the other crew members (Including your Purser, whom you must brief, nature/intention/time remaining etc.) to assist in your decision making, ATC usage of course, and then plan your return/diversion. Count on a little IFR demonstration, like a hold entry or intercepting a radial. All then followed by a raw data ILS (no flight director) single engine landing. There might be an auto pilot, there might not, depending on the company doing the assessment. Should take about 30 minutes. Don't expect much of a debrief...
The OP is right on the money about the HFCRM thing, I've seen seriously high time guys blow a great shot at a good job by being a handfull...and a few low time guys shine despite being a little ropey flying the sim...it's all how you treat it. All this is for that elusive first jet job I hope?
I once asked a sim evaluator what they were looking for, basicly he said that they want to make sure that your CV and your flying skill match.
Better to find out in the sim evaluation than spend thousands of dollars and find out you wont pass the type rating course.
One area where lots of pilots have difficulty with is Raw data flying, and the sim evaluators love to give this.