The passive gameplay
is the weakness.
I'd put tanks slightly below average as a factory, and both Blitz and Minotaur below average as units. Often a team will have a lead of several thousand army value, but crumple under pressure anyway because too much of that army is Minotaurs. Blitz, on the other hand, can do well for themselves by setting up hit-and-runs and using their stuns to escape repercussions; however, this is skill intensive if you want it to justify Blitzes' hefty price tag, and using autoretreat is just asking for it to punish you by dropping a stunlock.
The Tank Foundry isn't so bad as a factory to demand buffs. But I'd oppose any attempt to nerf Blitz or Minotaur in particular.
