I'm nothing close to a Charmed expert and I'm not devoted to the serie, but I've watched the show on and off and I really liked thid episode.
First, I like the hole Chris-came-back-to-save-Wyatt storyline and that's what actually got me hooked. I know that he wouldn't disappear, but I nearly lost faith until Leo and Piper finally did... well you know.
Though as soon as Leo was doomed because of the poison, I kinda knew that it was about the bring them closer.
I was choked by the ending!! If you'd ask me WHO was behind this all, I'd never would've Gideon... Now I know that Wyatt is a threat to EVERYBODY in the future, but why didn't he worked it out with Leo and Piper. Being Leo's mentor, I'm sure he'd have listen to him. At least he didn't embrace the dark side yet. Looking forward for the next episode and maybe one day, I'll catch up with the entire serie... who knows :P