Depends alot on the game, but teamwork counts alot for integrity of results and likelihood the team is practising together, etc.   I got alot more faith in an underdog bet when I believe that team has underlying potential to keep improving and surprising in their results, alot of that revolves around the team spirit being healthy.   The biggest mistake people make is counting results evenly when some games wont have the effort spent on them over others, some enemy teams or the map choice allows an easier result.