Completely appreciate the advice and well thought-out post. Today was the final day for me in terms of my patience with Grand Arena. I have (1) G12 character, (3) G11 characters, (2) G10 characters, and everyone else is G9 or below. I have three viable teams about 60k power but have a somewhat deep roster. This causes me to get consistently paired with players that have a far more focused roster.
As an example, I faced a player today with every single squad on defense at lvl 85 with G9-G11 squads. I can beat one of those with my revan lead (my only G12 but was G11 when I locked). That's it. His Jango lead BH squad? Killed all but Jango/Dengar. I can't compete so what's the point? My defenses? Oh they were gone within the first hour. So since I'm going to get crappy rewards regardless, may as well not even try.
And that mentality that I arrived at is 100% the problem. The mentality of "I know that there is absolutely no way that I can even compete or have a chance of winning" is the inevitability for people matched up against really good players that can easily stomp them. It can be fixed and it should be fixed. I'm not asking for an easy win, just a chance, a glimmer of hope that I can make it there through skill or luck. But when I'm faced with all 85 and G9-G11 squads? Yeah, no hope or glimmer there.
My thoughts are to balance the GA matchmaking the same way that GW was balanced, off of your highest squad arena ranking. Sure some newer players won't play SA purely to troll the system, but that's the fairest way that I can think of. I WANT to like GA, I really do, but I just can't in its current form.