As for dominion, I'm still loving it, but I see what people are saying in dominion more, when you get an organized team. The fix for it is fairly obvious.
1. Fewer total heavy weapon drops, fewer rockets/snipers/shotguns/scattershots, more needlers, speed boosts, grenade re-ups and rifles.
2. Each team gets the same total number of ordinance drops. IE, so if you control A+B you get one ordinance load split between the two bases, but the team controlling C gets the full load at C to keep it from being imbalanced. Vehicles stay the same, as they are needed to soak up the rocket/splaser shots.
I had a great base capture this morning, Sneak into the base, boltshot the shotgun guy, charge in with his shotgun (Which was a rocket launcher when I killed him?) get a double kill, but die to a from the grave grenade, but open up the path for my team to take the base. Unfortunately, by that point they only needed a final resupply at A to win.
I felt like Reach worked much better with a reduced AA and weapons set, but in Halo 4, having all the AAs and perks and shit adds so much to the game, giving you lots of crazy ways to take and defend bases and such. I just wish there wasn't the damn bar filling reward system, I hate having to wait to finish off my builds.