I've played against someone with my Bro a few times, and all they did was tackle with one, and shoot with the other...just like the rest of you guys before me having the same experience.
Even during single player games online.
I faced one guy (he was using Bowser), and there was about 30 seconds left. And he must've been tapping "A" every half a second, and flicking the remote constantly. Because all his players were doing were checking and the number, which indicates the player he's controlling, was switching to all his players every half a second. and I could never score, I couldn't move anywhere on the field for God sake either. He was just flicking and checking and switching

.I couldn't even get a shot off...It was a real piss off cuz he knew he had a goal lead on me (4 to 3) so he knew if he had all his players checking me, I'd never get a shot off or even a deke in to tie up the game and have a chance at winning

!
God he pissed me off, I was almost ready to disconnect...but I swallowed my pride and stuck it out. Although I didn't enjoy the loss

...
I know your pain guys...I know it all to well