Marvel’s The Avengers (a.k.a. Marvel Avengers Assemble in the UK) is the summer popcorn-movie laced with a heavy dose of testosterone instead of butter. It’s the superhero story stabbed full of steroids. It’s like Hollywood stole every syringe from L.A.’s rehabbing rock stars, heisted all the Botox out of Beverly Hills, and swiped the human-growth-serum...