I get hit by maintenance all the time and can't play that night (work + family during day/evening)
I'm ok with it, but I can see how it's getting frustrating for some... my wife complained last night and this morning that she's getting sick and tired of the maintenance happening too often and thinking about quitting... O.O (She'll probably not quit, but when she does it's hard for me to get her back in game... /sigh)