There are a lot of under-used skills, particularly for the generals, that could use some love. The QoT is a case in point. She has her brambles and spikes, and everything else is mediocre at best. If her less useful skills got buffed, I think it would benefit her and the entire game.
As I said, I think Erebus needs some buff to his secondary skills, particularly his coven upgrades and perhaps his mist form. Give him more ways to play than just swarm/bite. While I do think the bite nerf was justified, I do think Erebus needs help in other departments to balance him out.
That said, I think Regulus' mines are currently the biggest balance issue presently. As has been noted, they're currently being used as hand grenades. Presently I think snipe is fine, although as some have pointed out a 5v5 all Regulus team with good coordination might be a bit over the top. Gotta wait and see if that's an issue, but with how few 5v5's actually got off the ground prior to the recent connectivity patch it's way too early to make any conclusions there.