great booster. All the maps are fairly well balanced, the scout choppers are fun and also provide extra UAV, which is nice.
If you don't like tank battles, you won't have much fun though.
Open-Range tank fighting like you haven't seen before, yay...
On Harvest, you need to move quickly and try to outcap the enemy, as has been said before. Not much use in walking here. Use transport, and hide when the heavy machinery rolls along. AT and Engineers ftw. No other class is really needed. Because of the open spaces, flanking manouvers can be pulled off easily though.
Road Rage is a different story. Not much room off the main road, and the number of CP's is quite limited. Flanking manouvers on foot or via light transport can easily be located and countered with those nasty scout choppers, which can get around on the map very fast and are very effective against infantry and light transport, especially because of the integrated UAV.. Armored support is crucial, as well as a strong defense and good pilots to stop enemy armored convoys.
In the end, it's all about the central flag on the overpass. If you have it, the enemies' tickets will drain, if you don't yours will.
Midnight sun reminded me a little bit of Fushe Pass. Because of the slight darkness and the rugged terrain, this map is a little easier on infantry, as it is harder for the armored vehicles to spot targets. Also, the CP's are a lot closer together, so you can actually get somewhere on foot. Thus, infantry fighting will be more intense. Unfortunately, this makes Midnight Sun also the most sniper-infested maps of the three.
Teamwork is essential here, as the number of possible river crossings is limited.
Summary: a lot better than EF. AF maps are sure to find their way into standard mapcycles.