Don't feel like you suck because you get beat by the computer. The computer on WC3 can control every single unit at the same exact time, while you and I are stuck in the reality of only being able to control 1 unit or group of units at a time. Therefore, the computer has a very easy time countering your attacks and you'll often see the computer win battles it really shouldn't because of that.
If you want to know a good way to beat the computer, build up a strong base defense and then "lure" them into it. What I mean by that is attack a single enemy unit then run back to your base. The computer will follow with all his troops and you should make quick work of them. Afterwards, the computer will often keep sending individual units at your defenses as he produces them, wasting money and allowing you to build up and expand in the process. It's the same AI flaw as was present in StarCraft.
The computer may be fast, but it doesn't have the intelligence to keep up with you in the long run if you play defensively. Just keep in mind playing defensively against human opponents works just the opposite and most often results in your death.
Don't try to outbuild or outrush the computer cause it's probably not going to happen.
And if you want to see fast build orders, save your replays vs the computer and watch how it builds 🙂
