Yeah, I think this is the major difference. Being from Europe I don't really know anything about American football or baseball beyond the basics, but watching a game it's pretty transparent whenever someone does something good. I don't need to know batting averages, the difficulty of plays, or why a play was exceptional to know when a player or team scored points.
Games like MOBAs are opaque by comparison. I can see roughly what's going on but I couldn't tell you if a team is winning or losing to save my life. In football if the guy holding the ball is out in front of the defending team and running to the end zone I can guess he's going to score a TD, but a team can look like they're getting whooped in DotA but really they're tricking the opponents and someone is making a sneaky play in a different corner of the map or someone has an ability or gear that means the situation is the reverse of what it appears, etc.
All of that is really only apparent to someone very familiar with the game.
Games like MOBAs are opaque by comparison. I can see roughly what's going on but I couldn't tell you if a team is winning or losing to save my life. In football if the guy holding the ball is out in front of the defending team and running to the end zone I can guess he's going to score a TD, but a team can look like they're getting whooped in DotA but really they're tricking the opponents and someone is making a sneaky play in a different corner of the map or someone has an ability or gear that means the situation is the reverse of what it appears, etc.
All of that is really only apparent to someone very familiar with the game.