Alright I've got a few points to be made about youEasy.
1. H4 Camera worse than Reach (throws you around the map when it tries to move you a certain distance from a piece you're placing into solid geometry; this happens pretty often - happened to me once today and I don't really forge anymore).
2. Pieces are much more tapered and often have holes in them when tiled (Wall Coliseum, Tunnels Short and Long, Block 2x2 talls are the first offenders that come to mind)
3. Poorer water (no water on any map but Forge Island, and Forge Island's is opaque, doesn't give us the option to put sand underneath, and doesn't really react to the player)
4. H4 Off Host glitch - makes it very difficult to coforge - when you're offhost and load up a map in forge, colors won't load properly and objects will be shifted from their proper positions
5. noisyyyyyyy (apart from Forge Island, on which the white is arguably worse than Reach's gray - at least we had different shades of gray..)
6. Purple FX and Rock Arch (most useful in their categories respectively) both removed
7. Dynamic lighting glitches and worries - makes indoor spaces look very bland, especially on Forge Island where you get Reach syndrome x2
8. No good flat ground (Forge Islands aren't even flat.. annoying for symmetrical maps)
9. Unnecessary polygons added - more lag worries (5x1 thin, 2x2 tall, brace large, wall coliseum, and the bottoms of bridge pieces are the prime offenders)
10. Some textures on Forge Island have part of the Ravine texture that shouldn't be there (ahem corner 45s)
I could go on and on, but the point is made. It is possible to make a strong case that Reach's forge is better than Halo 4's.
First part: Makes sense.
Second part: Been able to remove them? The biggest issue I have with this is the assumption that strafing and bullet travel time are bad. Not sure if this is a misinterpretation.
I'll give you that non-TU Reach matchmaking is awful. But Halo 4 vCoD Infinity Slayer isn't? And the matchmaking in all earlier Halos was worse than aforementioned Halo vCoD?
Balance (assuming you mean weapon balance) is certainly not the only problem or even the biggest problem in Halo 4. We need in-game ranks, a spectator mode, multiplayer theater back, and a spawning system that isn't absolutely awful (ridiculous that the team spawn influencer is bigger than the enemy's - it's a big part of why you can spawn with an enemy in your face.. unfair and frustrating for both players). The quality of the Reach menus and medals was also quite nice. Halo 4 has an awfully cluttered HUD as well (getting a distraction, revenge, kill, and/or comeback kill causes text to pop up in the center of your screen? a distraction, revenge, kill, and comeback kill are even worth medals?? If having those pop up constantly is not distracting, I don't even know what is..)
So you say that there's a 5x1 thin? There isn't because i forge daily and i see NO 5x1 IN THE FORGE MENU.
Also reach syndrome for forge world and for the grayness isn't better than forge islands sandy grass aspects and the brownish island with trees. It really isn't that bad, and you say you don't forge much anymore du to the things you've mentioned? Well thats probably because you're not taking a creative look at the things you can do in forge. Also some things have holes in them when tiled is correct but i mean if you're making a large map and you're testing 1v1s on it obviously someones going to look through the hole to see where the other persons at. But if you do it right you can make it so no one has time to actually look thought the holes. (Sorry for run on sentence) Anyways, you could just move the walls closer without using magnets (obvious way to do it), if you really don't like holes in objects then you really aren't going to be someone who makes things that look good without pointing out small details like such.
There are minor texture issues its objects but not enough to the point where it just looks terrible. The camera in forge i agree needs some improvements and the way you have to grab objects also needs to change, zoom needs to be brought back along with fine editing. Also forging isnt noisy unless you have your volume set high enough to REALLY here the background noises to being a monitor. Forging is a lot better in 4 but some things need to be brought back and some things to be tinkered with. But cut 343i some slack they're doing they're best to make Halo better alright? I mean this IS their first time making a halo game. (Yes they helped with anniversary but that doesn't count)