Castle 3 has way too much open space and some of the areas just dont have much thought put into them. Castle 4 solves both of these problems, even if it does make it a little more difficult to defend.
I prefer 4 a lot. 3 is just way too big, especially on the final cap when the attackers have to walk like 25 seconds just to get past the bridge. Also the raised platform on cap 2 makes the assaulting portion easier.
Im not sure i kinda like both cause you can still pick off people as a sniper but there are up and down in the two maps
Downs
Castle 3 - Is way to open and more easy to get picked off and more easy to capture the points.
Castle4 - Harder to capture caused by the closed of areas by walls and alot of sneaky corners where engies are safe which is also a up.
But overall the both maps are fun and gonna need to get use to Castle4
I like castle4 slightly better. I like what was done with stage 1, even though the first cap point doesn't add much it doesn't make it worse. The second stage is a bit easier for the attacking team now. The third stage isn't that great but its a lot easier to capture than the old one which had too many 20 minute defenses.