I really liked this trailer. I was pretty ambivalent about Clockwork Angel as a whole, but as always, these are trailers so I can't really take into account the quality of the book when I review them.
First off, I really LOVED the use of the cut scenes with the clock gears in the background. They were a clever use of special effects that left me wondering where she got them--certainly no fanmade trailer before this has had cut scenes like them before. I also liked the voice overs (FINALLY!) because they just added that touch of realism to the trailer. You don't ever see a silent trailer with only music; there is always some sort of voice or narration involved.
The only thing I can really say I didn't like was the use of Ben Barnes in the role that I presume is Will Herondale. He is so overused in fan trailers, I have to keep an eye out to pick trailers that don't have his face in them. Some people find him hot...well, I think he's kind of odd looking and way too old for a love interest role in a YA book. He's 30 years old, for God's sake. Please, I don't need him filling the shoes of my teen boy candy anytime soon...not even as Dimitri from Vampire Academy.