Let me just start off by saying Halo 4 is probably the best Halo game of this console generation multiplayer is fantastic (arguably better than Halo 3)and the campaing was great, with many intense action moments and some fresh new rail sequences and new first person interactions. However this topic isn’t about what Halo 4 does right it’s about the FEW things it needs to improve upon. Those two things being Forge and Theater.
FORGE: So a few days ago I posted a thread about how I felt about the new forge, of course, in traditional Halo forum style I was flamed up the YOINK for my viewpoints, with that being said though, I believe there was a mis communication in what I was trying to say, so let me give this another go
Halo 4’s forge mode is NOT bad. In fact it makes a lot of positive steps forward for the mode however with every forward step it take I have noticed it also takes a step back. For example: The addition of all the new tools (i.e Magnets and delete all) are fantastic new features that I love. However, the Forge spaces we get to use these awesome new tools in are less than spectacular.
Now, don’t take me the wrong way, cosmetically the three “forge” maps (Impact, Erosion and Ravine) are stunning. However the fact that none of them are truly blank maps is discouraging. For example, on Impact there is a giant structure on the asteroid you spawn on. Why does that need to be there? It doesn’t. Also, on Ravine HALF of the map is taken up by a pre built Forerunner structure. Why does that need to be there? It really doesn’t.
Now the second problem with the forge is the size of these three maps, there all rather tiny in size (I know, I know Forge world was WAY to big) these maps could have been a little bit bigger, especially if there are going to be pre built structures on them.
Pre-Built, permanent structures + The small map size = limited creativity.
THEATER: Next up is the theater, all in all this mode has not changed very much since Halo 3 You can still go in and watch clips of your games, take pics and vids, upload them and what not. However, this time around I noticed that you can only watch War Games. No campaign OR spartan ops. Why? I was able to use the theater in Halo ODST and Reach in both campaign and firefight? Why can’t I in this? The answer eludes me?
Also, you would think by now they would let you use the left trigger to rewind the video instead of using the clunky 10 second system 
So there you have it, those are my 2 cents on the things Halo 4 needs to improve in either a Title Update or in Halo 5. None of these things are game breaking by any means. Just annoying and it sometimes feels like a step backwards for the modes.
Also, if anything I posted is inaccurate please let me know. I have spent to much time in the menus searching for this stuff so your help would be greatly appreciated. 