I despise it when teachers dock points for attendance. I think that yes, there can be stuff that only you can get from class....but to dock solely on attendance is not a good idea.
My fiance's cousin died in March of 2005 unexpectedly. My fiance didn't get a chance to go through the grieving process or be with his family at that time...he took the day of the funeral off, but other than that he was too afraid of teachers docking his grades, so he forced himself to class. It was hard
This semester I got sick with a severe viral illness and was in the hospital and on bed rest for about two weeks. Because of this I failed my Greek class because the teacher said that more than four absences would not be allowed. I thought it was rediculous considering I was in the HOSPITAL (like literally on life support, the only way they kept me alive was by giving me everything interveniously, I couldn't even drink water!). I was doing quite well in the class before then (a "B").
Then one of my friends and I took a Religion Course together and she just refused to show up ("oh I decided to sleep in" or "I was talking to my boyfriend"), she passed the class with a "D", but she got what she deserved, if it would have been my Greek class that she was taking she would have been out of there!
I think that grades should be what you deserve. If professors put stuff from class only on the test, I am fine with that, but they shouldn't dock points for having to miss class (yes, both my fiance and I had written documentation about our absences, but the teachers didn't care).