What about it? Nothing new. been playing the maps for a while now

I truely hate piazza, spawns flip ever 10 seconds on tdm and search doesn't even let you leave your spawn half the time. There no time to take in where you are and what you should do next.

Liberation slows the pace down and is the first real sniper map in mw3 in my opinion. I don't know why but it reminds me of countdown in mw1. I really like it

overwatch is a mix of both piazza and liberation, lot of long sight lines, with some cqc. I like it but does feel like it was rushed for some reason. I can't quite put my finger on why I think this but I do

so Piazza=2/10, nothing great about this map other than the view

Liberation=8/10, nice and open, making a change but not as good as mw1 or mw2 maps

overwatch=6/10, good layout, nice view and use of colours, but feels like it's missing something

I think grif explained it pretty well.  I agree with that for the most part.  Overall, the new maps were a decent addition.  I just wish they would have spent the time to add some active environment type maps like Black Ops did.  Working elevators, garage doors to help a team hold an area, etc...