I have now played over 800 games of dominion alone and have finally understood on how dominion flows and what moves you should take. Before anything else is stated, I want to say that when you are searching alone, don't be afraid to make friends on the way because as you play you will begin to notice that communication is imperative and as you play on a team you will begin to notice a difference.
As I continue, I want to say that as I have played dominion for a long time. I've seen teams and individuals with k/d's with 4 be defeated with myself and randoms solely by their own demise of protecting their k/d. Their are those who are base sitters with power weapons and then their are the teams where they take advantage of the map control and use the vehicles and resupplies to begin to spawn trap. I have done this myself and it is fairly easy, It all requires execution and communication. But something you cannot lack is the objective itself.
I will be beginning to speak about my own strategies and tactics that I take on each map that I play on. I also want to say that I DO NOT GUARANTEE THAT THESE TACTICS WILL GUARANTEE A WIN EVERY TIME.
Exile: On this map I highly encourage that you take priority of both points C and B solely because C has the wraith while the opposite point has two ghosts. ( I wonder what is better). And then B has the banshee which can highly support the team. These are usually the objectives you need to tell your teammates when the match begins. I bet you are wondering why C has a wraith while A has two ghosts. Well, the main reason for that is because A has spawns nearer to B to be able to support if B was also on their side. Also a strong position on this map to control is where the banshee would spawn in BTB because from their, their is clear line of sight of B to crossmap those who are capturing B.
Longbow: On this map it is a bit similar. When you first spawn what you first do whether blue or red, you should take the initial rockets and head to B off spawn. Usually four people should head to B while the other two head to the nearest base that they spawn next to. Once bases captured you should have your team with a sniper on B looking down on enemy base along with a banshee raining down on them and the wraith from your base heading to the back of the enemy base taking down the spartans that just begin to spawn. This is VERY effective and at this point if it is successful for a minute the enemy should begin to quit from the pain. The other three teammates could hangout near enemy base with ghosts or have one guy inside their base with rockets so that if a straggler heads inside their base, they are up for a surprise.
Vortex: Not really I can support with this because this map shifts as gameplay moves. But What I see to work is to Take control of C and B. Take control of C because it contains the wraith and usually has the best luck with the weapons. And then take B because it is a pretty campable place to protect B and It does give you the best resupplies also.
Meltdown: Lastly with ths map I want to begin to state that people tend to dislike this map due to its massive binary rifle and incineration cannon spams but I feel like it is cool because it is different. What I do is that I head for incineration cannon that spawns top right of spawn in front of light bridge, and I continue to go forward into a cave then I move a bit to the left into the teleporter room. Use the teleporter and begin to shoot off guys that remain in their. This works over 90% of the time when I do it and I always take control of their base. This usually puts them in last stand. Also to state is that C has mantis and A has gauss hog. I prefer gauss hog due to its flexibility and strength.