It's hard to say until the beta. From the videos, I have a feel that at least some urban maps are too small, but it may be just a false impression and they are "just right" in reality. I really dislike maps like Metro, although I admit that I had fun with a chaotic team deathmatch in a small storage area in Noshahr canals with a high ticket count in the past. If most of the maps will be in size of Operation Firestorm with a similar pacing, it's alright to me. Especially if they will put in there a remake of my all time favorite - Kharg Island and not-yet-another-urban map later on. ;)
