wirehead
thinks
the problem with sitting in the exit row is that opening the door and riding the slide looks like fun.
can't say I haven't thought about it 
Gwênlyn
says
Doing so during flight might not be that much fun.
lindes
thinks
Doing so when the aisle is filled with standing-and-going-nowhere people at the end of the flight, though....... 
notes that the exit door is a plug-type door, thus it cannot open at altitude.