No question -- in my opinion -- Arena blew the game.
Several months ago I read a piece which quoted Arena years ago about the importance of resting players, playing fresh bodies on the field.
That's the exact opposite of how he coached the U.S. against Trinidad & Tobago. A vital game to win, or at least play to a draw.
Instead the U.S. lost 2-1.
The U.S. played away, on a terrible field that was like a water logged sponge from tropical rains. The temperature was very hot and the air very humid. Arena had fresh players on the bench who hadn't played recently, yet he started a lineup which was nearly the same starting players as the U.S. MNT game from just several days before.
Did you notice the lack of pace and lack of speed of play of the U.S. players? Looked like they were playing in cement shoes. They even seemed to be playing with a lack of effort.
Overall, Arena is a very good coach -- but on that important day he lined up on the field a starting eleven which was fatigued before the game even started.
Arena's decisions in that game are beyond me. And, if he didn't trust his bench, he should have selected other players.