Please give examples of games where the rest of the team was playing great and Romo single handedly lost the game. The only one I can think of is against the Lions which I really wouldn't call a big game.
Romo did not win many big games. He is historically known for not winning the big game.
2006 against Seattle
2007 against the Giants
2009 against the Vikings
2012 against the Skins
2014 against the Packers
2011 opening game against the Jets
2008 against Pittsburgh
2012 Loss to Broncos.. 51-48 I believe.
week 17 losses to Giants, Skins, Eagles in different years
These are just the games that come to mind for me..
Romo was a good qb when the requirement was to be great. Whatever excuse you want to make he was not able to get it done whether is be talent around him, coaching issues, tactical issues, his own mistakes.
A career of coming up short when it matters is what it is. I personally loved him as a fan, thought he was super talented and always thought he could compete with the best of them. He obviously has a great mind just watching his analysis.