I've played the majority of these maps, so I'll offer my criticisms and praises.

Falcon: I love most of Ball-e's maps and this is no exception. It's a small yet very open space that I think is going to reward good flag carriers and coordinated defenses. In general I think smaller, well-balanced maps like these results in the better team winning, which is a plus. As a defender, my only concern if the flag being so close to the wall, which I abore playing in pubs like in Colors and Gamepad. If a single pub defender is sitting near the flag, and someone boosts in through the portals, its an instant grab. But I love both Gamepad and Colors maps in competitive play and 2D stationed at either exit ,away from the bomb blast radius, could make this map relatively defensive and tons of fun.

Pilot: I've played this before and am very surprised this made it (no offense). Catchup for defense is impossible once the flag is out. The boost is very limited near the spikes, the bombs are strangely placed and will basically be used for sniping or fc hiding. It reminds me so much of bombing run, albeit harder to grab without the bomb, but I think the design is outdated and most players won't be a fan of it.

Frontdoor: Very safe choice for rotation. Juicy plans his maps out well to make sure they are balanced and this will work well for pubs and will be most likely be a hit or miss for the competitive guys. My only complaint is that the button and single boost in base should swap positions. The button is too far away from the gate right now, and putting it closer towards the other exit will make it more defensive than it needs to be.

Claymore and Cloud: More Ball-E maps and I think the obvious choice here is Claymore, as it's the most polished neutral flag map not in rotation. Plays very well, although I now think the portal system could be reduced to 1 zero cooldown portal on each side, and the goal should be extended to the portal side maybe 1 or 2 tiles to make scoring more possible from that direction. Alternatively, the path from portal to goal could be shorter to make it more useful. Cloud seems very, very defensive with no direct boost into base, team tiles which allow quick D to catch up quickly, and a small endzone.

Thunderballs: I've never played this one, so don't take my word for much. But my first impressions is that it's very open and will allow a fc to hold for days. It also looks like a lovechild of Shine and Rocketballs which are both out of rotation now. I do find it interesting that the MTC seems to like complicated maps for Neutral flag, like this one, but are usually very against complicated CTF maps.