When I went to school (Kentucky), I was basically taught that General Lee was a brilliant leader as well as a brilliant, Christian person in general. He was faced with a tough decision on who to fight for(The Union even asked him to join them!), but he ended up going with the side that his home state of Virginia picked. I was effectively told that Lee was a great American despite him having fought for the Confederacy.
I always just assumed that that was true. But now there was this huge conundrum over at Charlottesville that all started with the possible removal of a statue of General Lee. And now I'm wondering if Lee was actually a bad person. Was he? Was my education utterly borked?
'Bad' is a matter of judgement, of course, but there have been lots of answers related to Robert E. Lee on this subreddit that will give you more information on what his actions and beliefs actually were:
More can be said on the topic, but you can get a jump start on this previous, related question answered by /u/trb1783.