This episode was certainly the most shocking episode they've done, but not the best.
The bad guys managed to take over the facility way too easily. Hardly any resistance at all! Also, too bad about Red's people, killed so that the episode could be a shocker. In general, I'm not opposed to 'main' characters being killed off, but I don't like it if it's just for the shock value of it. I have a feeling that nothing will come out of it and we'll be stuck with Red and bland FBI agents, but I'll watch the next few episodes to see whether it will impact the series in any way (who am I kidding, I'll probably continue watching the show no matter what