Well when I started I did enjoy grouping up/Hoarding a base. Eventually I changed my gameplay because I wanted to start fighting Air to air targets. Not builidngs and ack ,or the occasional uppers. So go do what yah do IDC. Falcon, Im sure you could defend 15 lemmings with 4 guys that's fun some nights. I'll call BS on 15 decent sticks vs. 4 that's mad talk.
My gripe is the 15-20 guys waiting till most log off for the night to start steamrolling bases . From what I remembered MW, had eny for larger squads on 1 side? /rant over 
+1 on this.
I think the normal pattern for just about anyone that comes into the game loves to join those missions. I did and yes I had alot of fun.
After a while you tend to get bored of fighting more green guys for that poor sap that decides to up. Many times of landing with a full clip of ammo. I just couldnt see where any fun was in it anymore.
To the 2 weeker thats a wannabe naplolean armchair leader, that kind of play is even somewhat excusable. I just cant imagine how people can do that for years and years and still see the fun in it. Most in part I think what has to do with it is the whole idea of being chesspiece loyal. 99% of these guys that play the race to reset are guys that have a frothing hatred for the other team. Most guys that have fun switching sides dont participate in that type of gameplay because they could really care less what state the map is in.