What are you thinking of The First until now?
Many fans considered him a very corny big bad but i liked him
Haven't really learnt much about him yet, but I like the idea of him using the appearances of the dead and the way he's hinted at does give the sense of something pretty large-scale. It reminds me a little of how Glory was set up in Season 5. I'm looking forward to seeing more of him.
I'm guessing the demon in "Apocalypse, Nowish" is the big bad of Season 4 of Angel?