You were lucky that game your opponent was a noob.
first, never build gargs versus orc. you would do better with fiends. they require more micro but arn't owned by berserkers and batriders. One thing I noticed is u did not creep efectively. you could have won ealier if ur hero was a higher level. also I noticed even with gargs u stood around. it is never smart to stay in one place and twiddle your thumbs. keep moving, keep doing something. You could have taken out the foutain in the middle and scored a high level item.
also, meatwagons wasn't the best idea to take on his base. Towers and burrows are medium armor and doesnt take the extra bonus that fortified does. I personaly would have either gone the route of destroyers (magic deals insane damage to medium) or abombs to soak the damage away from fiends then coil the abombs. Also when undead you should always build 2-3 statues.
It was smart to put the expansion up, but when u do that, keep your towers clsoe to your acolytes and build spirit towers, not nerub towers. u can build one nerub tower, but buildlike 4 spirit towers.
[edit]A second hero would have helped also. a solo hero is good to an extent, but the dk is not a good solo hero. he doesn't have the stats. build a lich or a CL second and maybe even build a thied hero[/edit]
Finaly, scouting and micro is your fiend. you should practise on your micro, like not letting your dk take all the damage all at once. he was put into red twice very quickly. If you scout often at mines, you would discover his exp early. you did a good thing about 20 minutes in with the fiends, but u should have had some abombs.
