Didier Drogba’s goal, from Chelsea’s one strike on target, gives the Blues something to defend in the Nou Camp on Tuesday.
Koeman added: “I watched Chelsea defend for 90 minutes and I was appalled they did not try to make something more of the game. I have no admiration for Chelsea’s approach.
“And, let’s face it, this tie could have been all over by now. Barcelona could easily have won in London.
“Let’s hope football will be the winner this week and the team with the best approach goes to the final.