competing against highly superior tech and numbers as soon as each level starts.grow old waiting for anything to be built.absolute imbalance for the player.computer AI will smash you while your units sit there blind.total joke and uninstalled.
Begin with the campaigns on easy.
Then play on medium.
Then play on hard.
Then realise this is not Starcraft or Command&Conker
The play again, this time remembering to build defences.
And remember that you need to send the war units on patrol if you want them to keep moving. And make sure both battle units and defences' attack orders are on either "return fire" or "fire at will". If it is on "hold fire", theyll happily be slaughtered without fighting back.
If this doesn't work, there's something wrong with the installed AI.
Also, you can assign construction units to guard the factories, to speed up unit building. I prefer construction aircraft, as they can be unlimited (within the total unit count allowed, anyway) on each factory.
Also, ensure that your metal and energy income and/ or available resources are enough for each unit; running out on either (or both) has a very discernible effect on the speed of construction. Also, what managed to catch me off-guard in the beginning, is that the weapons use energy for their ammo - so if you run out of energy, you'll have both a longer building time for both units and buildings, and a reduced rate of firing for your weapons. I think the rocket launchers are the only ones that do not have this problem; plasma and laser do.
And very important: all radars, sonars and facilities (like targeting facility) use energy to power them. Including the radar on ships, aircraft and vehicles.
I hope this helps.
Also, get the 3.9 update and the 1500 unit patch and the Mega Map. Those also help a lot (I cannot remember the 5,000 unit patch working for me).
And on the skirmish menu, press * then X, to allow up to ten players.