I voted that the maps are OK. I like the maps, but I think that for 800 MS Points, they should have included a little more. Maybe even a few more maps, especially as one of the maps is ripped/edited from the single-player campaign. I also think it would have been cool if Infinity Ward did an update which adds a new game mode (like a conventional capture the flag to partner domination), and perhaps some new guns and classes, but that's just my opinion.
Creek is a fun map for sniping. It looks nice and has a lot of cool spots to execute the sniping from (the grass area in front of the house at the far end of the map, e.g.). Its possible to snipe and be sniped from pretty much any area of the map, caves notwithstanding. Speaking of which, said caves do get rather overpopulated during helicopter attacks.
Killhouse is borrowed from "F.N.G" from CoD Singleplayer, and is incredibly irritating. I'm just not into tiny maps, and therefore treat this with the same contempt I have always had for Shipment. I always thought Shipment should have been a team tactical (3v3) only map, as opposed to also appearing in the 6v6 games, and it seems I/W latched onto my train of logic by doing this with Killhouse. I guess they deserve credit for not making the "Shipment Mistake" again, but I still don't like the map.
I like Broadcast but it seems a lot of people I play with can't stand it. The little box above the main television room is a great place to lurk about and get a few kills, and the indoor environments are generally nice on this map. Whenever I go outside onto the roof I normally tend to stay alive for all of 10 seconds, so I now generally wait about on the stairs and run through the lobby like a madman.
Chinatown is average, in my opinion. I liked it at first when I was playing on my own, but then as I was trying to communicate to mates in Team Tactical matches, I found it very hard to explain which building I was in because they all look exactly the same from the outside. I tend to use the "Chinese Laundry" and the "Porn DVD Shop" on this level quite a lot. When playing "Domination" on this map, always go for A and B, capture those, then camp your team in the building between the two, and you will be guaranteed to win - Im not sure if thats a good thing or not yet.
On another note, is it just co-incidence, or are the developers putting the new maps in circulation more than some of the old ones to convince more people to buy them?
