Well, apparently all major networks suck. I don't know about WB, but FOX cancels all the good shows, and UPN is the network that made Star Trek: Voyager an unwatchable 25-year-male-audience boob&action fest and introduced guest stars like The Rock. (Does that betray a little bias?
I'm sorry emma, bashing Voyager is in my nature.)
Anyway, I doubt UPN could support a show like Angel if it's like you've described it.