I think that this is quite annoying. I join a lot of games that are already in process when I start Matchmaking. Usually, I join the side that is losing with a lot of points in difference. This is bugging the hell out of me. I think that in-game joining should go !
Now to the Forge issue. I always loved Halo: REACH’ Forge World. A lot of objects, space and money. Halo 4 improved Forge even more, but there is no map that can even come close to Forge Worlds size. Forge isn’t being used a lot for that reason on Halo 4. If 343i really wants its community to start playing Forge, they should add a bigger map to the Forge!
Other than that, I’m loving the game so far 