Must admit, I'm not enjoying the maps anywhere near as MW1 but then again, I can't remember what maps MW1 launched with and what were subsequently added.
MW19 maps had that awful issue where you would attempt to cross a road and be immediately shot from a window. At least MW2 seems to have improved on that!
I think overall there are some really good maps but it does all depend on the modes you play.
Al Bagra - great for Hardpoint and Search and Destroy, not so fun on TDM as there are quite a few power points with really strong sight line that people just wait in. Those work in objective modes as you have a fight for control over them, but in TDM the fight becomes entirely focused on these.
Breenbergh Hotel - haven't played this much at all, it was a bit ropey in the beta but I've had fun playing Hardpoint on it and not had fun playing TDM on it.
Crown Raceway - great for Domination, Hardpoint and SnD. Ropey on TDM.
El Asilo - great for TDM, great for Hardpoint and great for Search. Domination is 50/50 as the spawns flip so easily, it's essentially an A/C flag swapfest.
Embassy - one of my favourite maps so far, wish it came up more frequently. Great for SnD, great for Hardpoint.
Farm 18 - fun to play but wouldn't say it's my favourite, hardpoint plays alright on it.
Mercado - another decent map, not my favourite but no major complaints.
Border Crossing - I skip this every time it comes up as I'm fed up of dying to exploding cars...
Taraq - brilliant for SnD and Hardpoint, a bit rubbish for everything else.
Zarqwa Hydroelectric - my favourite map, I feel it works well on all modes.