Rise is super easy to lock down the B flag when you've got something like the Man-o-war. That map flows really well in my opinion.
Splash was okay, but I was on a terrible team that didn't know how to cap flags.
Gauntlet seems okay, but the B flag is a death trap, and it's hard to see in the jungle.
These are only after one game, haven't played on Skyjacked yet.
I've played all maps atleast twice now and I'd rank them as follows:
#1 Splash due to the complexity. At first it felt like it was too big for CoD but once you get the hang of it, it actually turns out to be a very cool map.
#2 Rise. Aesthetically not my favorite but as you say the map flows really nicely.
#3 Skyjacked. Delightfully compact and to a degree fairly predictable for the compact map fans looking to complete shotgun/knife challenges. This is based on a few quick go's though and the fact that knives and shotties seemed to be my doom most of the time.
#4 Gauntlet. Not sure what it is but this map is my least favorite, it certainly doesn't mean its a bad map but something about it just doesn't make me "feel it" and the B point in Dom is definately quite open though if you got some back up and you go prone next to a crate you should be fairly safe.
[Edit] Finally got all my shotguns golded, the sheer relief I'm feeling right now for not having to touch these silly things cannot be described.