Time for my once-every-three-months post to put down my opinions.
Anyway, regarding Anakin's turn to the dark side, I personally think it was too quick while in Palpatine's presence. I can understand cooperating with Palpatine and doing what he asks, but not pledging undying allegiance five seconds after yelling "What have I done?" (My own plot-hole bridge is that Palpatine used the lapse in Anakin's guard to shove a meme into Anakin's mind, hence the reason why Anakin looks stoned at the time.)
And regarding the younglings, I actually didn't have a problem with Anakin doing that (I mean, plot wise. I'm not condoning the slaughter of cute Jedi children, after all
). It seemed to me that he was basically thinking "I don't want to do this, but I have to." Kind of a resigned, bitter acceptance, or at least that's what I got from his facial expression. (My wife has determined that Hayden Christensen is a very good actor when he doesn't have to speak. Look at ep2 and ep3; all his best moments are when he's completely silent, and he actually does a good job of showing emotion)
So that's my two cents. Take 'em or leave 'em.