Make revenge useful again
With the new matchmaking system, combined with the fact that SC doesn't seem to care how a large portion of players somehow seem to be "always online," makes revenge useless. My defense log is full of players I can never hit back, even if I start hitting the revenge button as soon as they attack me, someone always seems to already be attacking them.
Fixing the online only problem is simple, boom beach already only gives you a 4 hour safety window, so implement that so even if they are online you can still attack them.