I just started playing and decided to try a tactic that always worked often in Starcraft. In this game, it always works!
First off, you'll have to be fighting either faction, but if you're Magic you'll have to fight Tech no mater what. Or else it simply won't work due to the Daemon rushes they constantly try to create.
Okay onto the tactic. Let me divide it into two sections.
Magic:
First, get gold. That's the only necessity. However, make one person get stone and one person get wood.
Second, put your rally point over gold, and keep making Initiatives. Remember, you're against Tech if you're Magic, and they won't Daemon rush you.
Third, when you have 750 gold and over 15 Initiatives, make 10 of them into Battlemages. Then prepare for an attack.
Keep making Battlemages, making sure at least 5 Initiatives are gathering gold, 1 Initiative gathering stone, and another 1 gathering wood.
If the attack does come, you should be able to ward it off. If it doesn't, then that's a good thing, as you won't have to make more Battlemages as reinforcements. But keep making them!
A few minutes into the game, create a Summoner Guild and a Library. The Library contains EXTREMELY useful upgrades for the Battlemages. Also, your beginning Summoner should not be used yet, so make that into a Drake Rider. Research the upgrades that give your Battlemages +500 EP and the one that gives them (I think) +50 EP and 1 Range. The 1 Range is invaluable.
Find the enemy base. This is VERY important. Once you have over 30 Battlemages if they attacked you, or 50 if they didn't (they might have machines already), go attack the enemy base. Your Drake Rider should have found the enemy base by the time you've gathered the army.
Even while your Battlemages are attacking, keep making Initiatives in case of a counterattack (if your attack fails). It shouldn't though, and your Battlemages can take down any Guard or Swordsman before it reaches them, and has a little less range than Archers. If they have machines, they should only have a few, so it's not that big of a problem. Here's the order of eliminating units:
1: all machine units IF they're attacking you
2: Swordsmen and Guards
3: Archers
4: FOOD. KILL THE FOOD AND THEY WILL DIE!
5: Watch Tower
6: Workers
7: other buildings
That should give you a victory, but in case it doesn't, you have more Battlemages guarding your base.
Tech:
First, get your Workers working! At least 3 Workers chopping wood, 6-8 workers getting gold, and 1 worker getting stone. You might want more on gold and wood though.
Second, make a Barracks. Then train as many Swordsmen as you can! Against Magic it's to hold out against the Daemon rush, against Tech it's for simply defending your base.
Third, if you're against Magic, then make another Barracks and a Blacksmith. You should have held off the Daemon rush with your Swordsmen. Against Tech, do the same, but wait a little bit if they did not attack.
Fourth, upgrade Piercing attacks, and start making Archers. AS MANY ARCHERS AS YOU CAN. Resource management is harder with this faction, however, as you can't make your Archers pay yourselves off as with Initiatives >> Battlemages.
Keep making archers until you have 30-50. This should be enough to attack their base. They might have some pretty advanced units but upgraded Archers can take down even Dragons/Machines if there are not too many. This should bring you a victory, but just in case it doesn't, keep making GUARDS. That's right, GUARDS. If you're going to lose, then finish off any flying units. If you're unable to, stop making Guards and start making Archers. Here's the order to kill units:
1: Dragons/other flying units --or-- machines IF they're attacking you
2: Drake Riders/Battlemages+ (any more advanced forms) --or-- Swordsmen and Guards
3: THE FRIGGEN GOLEM --or-- Archers and the Watch Tower
4: Initiatives --or-- food sources
5: energy sources --or-- workers
6: other buildings
That should bring you a win, but in case it doesn't, you have Guards protecting your base.
The point of this rush:
1. Unlike melee units, ranged units can attack in swarms considerably larger. Melee units can also do this, but they'll body block each other and it'll create a large puddle of blood for the attacking team, especially if the other team has Archers and Watch Towers.
2. They can take down flying units.
3. In this game, they have as much armor and HP as basic melee units, and that's what makes this work.
4. They do more damage than melee units.
5. They kill any melee unit in swarms before they're even touched.
You cannot be completely lacking of skill to do this tactic. I remember doing this in Starcraft, but it didn't work if I got Zergling rushed. The Hydralisks/Goliaths/Dragoons practically could rip through any base, unless of course they had tons of carriers or something. Usually it worked best with Goliaths or Hydralisks, as Dragoons have an extremely slow attack rate and they're hard to transport.
Whoops, almost forgot to compare the two factions for this tactic:
Bolded is what is good about them compared to the other one.
Battlemages --- Archers
Resource Management --- Resource Management
Cost --- Cost
Range --- Range
Damage --- Damage
Effectiveness in Swarms --- Effectiveness in Swarms
Availability --- Availability
General Effectiveness --- General Effectiveness
Pre-Creation Defensiveness* --- Pre-Creation Defensiveness*
*These are other units. With Magic, if you create an army of about 10 Daemons (500 gold), combined with your Golem and at least 5 Battlemages, is enough to hold out the Daemon rushes. Tech, however, simply just use Swordsmen.
You decide which one is better. Both have 4 pros. I like Battlemages better simply because their spells look friggen awesome. But Archers looks cool too, and I think they're more useful as you can beat either faction.
EDIT:
I did a few more times. It's extremely hard with Battlemages because of the time it takes to morph. I lost a couple of times just now trying this. But I owned with Archers. I think Swordsmen defense is a lot more safer than Daemon defense.