It was going good then they nerfed user heroes. I'm sure it just to get us to spend money on upgrades. Suddenly the AI can block everything and interrupt combos whenever they want. It's unplayable this way, it takes your best team to win most champions league matches even when you outmatched your opponent. The solo raids now take much longer to complete and user heroes do less damage by about 50%. I'd wait for the inevitable update that reverts these issues before jumping in.