You guys don't get to observe it, because the pax don't open the doors on your jets, but based on what I've seen flying little planes I wouldn't count on the exit row passengers to get the doors open. Ours only get it right about 50% of the time under completely normal, non- emergency situations.
Let see........many exit row pax I've observed are people I wouldn't trust to be capable of getting the exit open, much less assisting. Being more of a hinderance is more like it. Sure, kids and handicapped can't sit there. But I bet those two classes of people would be far more effective than the person paying zero attention to safety brief, and who has to be prompted a few times to give the verbal "yes" to the FA when asked if they can perform the duty, otherwise they are completely disengaged, and their yes answer to the FA is dismissive anyway. Or the person who you just know has zero idea about what the exit is, much less how it even remotely works, but answers "yes" anyway to the help question, because they want their exit row with more legroom.