Yes, I remember when Bayern lost away to Feyenoord with a big score, but made a crazy amount of attacks, but could not score a goal... But Bayern at home is a completely different team, in Munich it is very difficult for any club to play against the hosts... I think that Inter will definitely have difficulties to at least draw in the first leg...
I also have the same opinion as you where Inter Milan might have a little trouble to win at Bayern Munich's home, although it doesn't mean it will be impossible to draw. But as you said that Munich will do everything to win in front of their own supporters so Inter Milan must really be able to keep their goal from conceding more goals so that in the second leg Inter Milan can have a chance to turn the situation around. But on the other hand I also think that their match will be quite fierce because this is a round where every team must be able to win against any opponent.