Blobbing. MGs from all factions should punish blobbers. Only the mg42 does so reliably, and even that can get melted from inside it's cone by lmg blobs.
MGs should be less diverse, more consistent. Looking at you maxim
Infantry in general take a long time to be suppressed by mgs unless
it's the MG42 (higher rof and supp) or a true HMG like a .50 cal or DShK (massive supp). Maxims got a bit of help in the last update from their Sustained Fire
ability getting +25% supp boost but that forces a reload before it takes effect, which negates any attempt to use it against a sudden blob. It should just take effect instantly and reload during if necessary.
For me, it's facing multiple heavy armor units. ATM that means Tigers and Panthers (a medium
I know), but can also mean "superheavy" units like the Jagdtiger which outrange most opposing AT. I know their wunderwaffen are a key part of what makes Axis fun but they're so common and so tough, it's a chore. Which is why I'm not happy about rumors that they're planning to reduce all heavies to 0cp or something in the next balance patch. That would annihilate most medium armor from ever being used again. You'd see TDs on Allies and heavies on Axis and that's it, apart from some niche units like the Ostwind or Centaur. That's not fun.
This'd piss people off but I'd support a call-in limit of 1 heavy and 1 superheavy active
per team per match, if they do it. This way you can replace them if lost, but you can't dominate the field with them. Would be amusing to watch people race each other so they get to play with the big tank. It would also ensure they'd become proportionally more valuable in larger team games.
If we're talking AI, it's their love of team weapons and their massive resource boosts meaning it's raining arty if they get the right deck. Former causes the battlefield to become a MG/AT/mortar graveyard, waiting to rise again, and the latter ensures any static position is essentially worthless. No fun! Also, for some reason the AI is really no good with OKW; sometimes they just don't deploy their HQs until very late in the game.