It was okay. I am not sure how to react by the ret-con. I guess it depends on what they do with it. My big question (which has already been asked) is how this affects Chloe's memories of stuff she did when knowing Clark's secret.
"Hey, Chloe! Remember that time that Clark was going bad and you used Kryptonite to stop him?"
"Well, I remember the Clark-Bad part, but..."
"What about the time you helped Clark escape the Phantom Zone with Oliver right next to you?"
"Hmm...well, I remember shooting lightening out of my hands, but..."