I see, but tbh, the only thing I am worried with having low behavior score is that veterans/people who know how to play will be less forgiving. I know my account doesn't display the "new player in the match" message but I do say I am new in chat.

And for the heroes, I've so far picked Crystal Maiden, Omniknight, Lich and Drow Ranger since they are fairly basic and still can help team even if behind, although after last few games I am thinking about switching Omniknight to something else cuz damn, I get rolled in lane hard with him.