Heh, the way to really kick rear is basically wall up with turrets and starbases around your vital areas, expand them onto one of the neutral moons for the extra resources.
Now with that done get two regular shipyards and two or three advanced shipyards.
Build nothing but warbirds/soverigns/cubes/whatever.
Now, while those are building begin constructing spheres/akiras/any phaser type small ships. But not the defiant or forward-fire-only ships.
Now, assign the super ships into fleets with the alt+# function. Get about 5 fleets together.
And for the big kicker, take all the smaller ships you've built, assign three to defend each of the larger super ships.
So now you have five fleets of upwards of 32 ships (Armada 1) or about double that for armada 2.
You want system slowdown? Hehe, take all the main fleets and have them move past the initial areas towards a starbase. Pure lovely fire-filled space.

Please note this doesn't work if you have to go through wormholes. For some reason ships told to defend other ships 'forget' their orders once they make it through to the other side.
Oh, and can someone tell me, in Armada 2, can you build Galaxy Class ships? They're in Armada 1, fires phasers and torpedoes at the rate of a sovereign, but don't have any special weapons.
I love the 'Junkyard' map!