I played up until about two months ago. Then I was at level 7 Imperial, usually attacking with 3 AT-ATs. The AI of those is "interesting". On some bases, especially centralized ones, it would work pretty well. But with a corner deployment, they either went wall hopping, shooting nothing, or targeting every wall in the base before actually shooting structures.
On defense, you'd think base deployment matters. But it really doesn't. Any rebel player who has a clue could steamroll you with a force including a couple of repair bots.
So with the AT-ATs bugging every other attack and defense being useless, I stopped playing.