Yet, when ich try MP out, I often get insulted for beeing a bad player.
From your post you know more about this game than anyone you are playing with.
RTS PLAYERS RULEBOOK
Rule #1: In team games blame your team mates for losses. Call them noobs and drop from the game early.
Rule #2: In 1v1 matches blame the map. All maps suck and are imbalanced is your battle cry. Then drop.
DR MOREAU'S 4v4 PLAYERS GUIDE
1) Do not lose squads, tanks, and especially team weapons.
2) Do not feed veterency to your opponent by not retreating. Soft retreat if you can.
3) If you are OKW or USF be more aggressive. OST or Brits be more defensive. Try to synergize with you teams army build.
4) Do not over extend your army. Push to far and you may lose everything.
5) Never put more than one unit on a point! Always keep your army spread a little even when attacking.
5) Pick commanders with heavy call in tanks or plane surveillance. Late game is all big tanks and artillery. You will either need to protect the last VP with a big tank or take out the arty piece on the other side of the map that is killing all you have.
6) Support your team even though they will not reciprocate. If possible help pushes they are making. Sometimes send a team weapon to their area since you do not have to micro it as much. It will get lost and they will not warn you because they are noobs. If they are getting attacked help them before they get rekt because your army will be next to get rekt.
7) If pushing the fuel is not working, do not feed vet to the enemy. Attack elsewhere or secure another VP usually mid. Also make fuel caches on points to offset the lost fuel if possible.
8) Make a mobile diverse army early. If the fuel gets held by MGs early start spamming mortar.
9) Make blobs. They work in team games. Dudes. Tanks. Whatever.
10) If you want a high score but lose on VPs, blob and retreat until the game is over. You will hold no VPs or fuel but will have a great score so you can blame your team.
11) If planes start rekking everything make anti-air out of your tier 2 building. OKW can now also engage its tier 4 for 60 seconds.
12) Push fuel hard and fast. Or be prepared to MG and mortar fight to regain the fuel.
13) Try to offset your infantry so that squad A runs over a point and partially takes it so squad B can finish taking the point. Dont stop to take points early and let the enemy get good position. Get to Da choppa!
14) Thou shalt not walk on all fours!