Avengers: AoU - Why does Ultron look so weak? His minions too.

[Robert_Downey_Jr.]

Black Widow and Hawkeye can just have weapons built for electronics like Ultron bots to be taken down. He doesn't have to kill anyone to be strong he just needs to knock down Thor or Hulk or maybe tear apart an Iron Man Armor. Hulk better not beat Hulkbuster unless Tony says something before hand "I can only hold him for a couple minutes" but from the trailers it looks like he loses and Black Widow calms Hulk down. Stark shouldn't be surprised by Hulk's strength though.