I'm all caught up now too. I can't believe it's episode 9 and they're still saying stuff like "It's the Blessing!" "Yes, but we need to find out what it is!"
In Children of Earth the aliens remained mostly hidden and mysterious until the end, but that was fine because we at least understood their intentions and motivations very early on in the story. In Miracle Day we've just had a succession of what I would describe as 'accidental red herrings', where the writers kept introducing things that seemed really crucial only to get bored of them or move onto something else, not because they were being clever and wanted to keep us guessing, but because they only ever intended to reveal the bad guy at the end of the series, and couldn't find a more creative way to fill up two and a half months of episodes.
Anyway, having said that, I did enjoy the episode. It had the usual annoyances (casual reference to the bad guy FBI woman being a lesbo, RTD having a cameo at the beginning, Esther sounding like Sarah Fucking Palin), but Rex finally acted almost like a real agent and the rest of the main characters had quite interesting dialogue. It probably helped that most of the episode took place in Gwen's house rather than having everyone charging around or sitting at computers talking technobabble.
So the bad guy is a giant crack. Maybe RTD saw what Moffat was doing and thought he'd one up him.
Speaking of which, Torchwood now takes place in an alternate timeline to Dr Who, CLEARLY. Amy Pond is NOT going to go back to Earth some time and find out that all the old people in her village have been cremated alive.