People will never be satisfied I suppose....however people speaking out about what they dislike helps games to become more refined, Forge is completely different situation to matchmaking for a start, so them examples don't really apply because the matchmaking community is notorious for being full of moaners...the forge community is full of people who don't want restraints on their creativity. The main concerns with forge are mainly to do with practicality or limitations we have been given, and the points that have been made on the whole are completely relevant...
The LS and RS button currently serve no function in Halo 4 forge. Free forgers and perfectionists would agree that the fine tuning/slow movement tool and the zoom tool are essential for precision and accuracy. While the new magnet tool is good for simple forging, we don't always want things to fit together in a certain way. It's not Lego.The whole point of forge is to be creative and unique, in the long run maps will start to show similarities because the magnets give forgers a 'certain way' of doing things.
You say you can make race maps, that's actually a big relief...oh, wait...we cant make the smooth/abstract/windy race map because we cant move items with fine tuning.. (if your a hardcore forger you will understand why). They probably already have the coding for the zoom and fine tuning from reach so therefore it would be an easy patch.
The issues people have with map size, human aircraft etc... are all personal preferences, however the difference is they are additions people want, not changes. its not a two way situation like you imply it is, people aren't going to be like "OMFG BUNGEE YOU GAVE US EXTRA TOOLS AND EXTRA THINGS TO MAKE US MORE CREATIVE THAT'S SO OP" a dlc could easily satisfy the community and if they still complain after that, then you have the right to get pissed off.
So in other words how DARE you get butt hurt over people trying to guide 343 in to a better forge through expressing their opinion. Whilst the new forge looks amazing and has some cool new features, Without the fundamentals it feels like it took 1 step forward two steps back. A simple patch for controls would shut a lot of people up and nobody is going to complain about getting bigger maps and hornet are they....