Your ten last games are on maps Sandcastles, Supreme Battlefield, SuperSpeedMetalX,..
All big maps or with water.
If matches get past the initial rushing those maps can take AGES to finish.
A porced up base on Sandcastles or some water maps is very hard to attack, even for good players.
Without superweapons: Impossible.
Superweapons are meant for excatly this situation.
The idea of game dynamics is that making defense slows down your expansion and map control.
But new players are not able to take advantage of that yet, so matches can play very frustrating.
Sometimes it goes that one player builds super-big defended base and then does nothing but grow it even bigger.
Then you can not do anything, the usual tips like "Use artillery! Use EMP!" do not apply then.
In such cases the big player should realize he has won and finish the others.
I would suggest to play smaller maps.
It might be that rushing suddendly seems very strong and can make for 'unepic' matches.
So maybe play small map but with a "No Rush" agreement.
One could argue it takes fun out of game, but it is not so much fun either if one player figures out a rush and noone in group is yet good enough to counter it.