A standard, template no-brain reply from someone who thinks he knows best and is not interested in the OP's thoughts.
Assumption: this is mid game or end game, blobs don't appear until at least mid game. So bear that in mind. Further, this is far worse in non-1v1 games; therefore 1v1 games are excluded from this analysis.
1. MG's (particularly Brits) get shot and uncrewed by a schreck-blob before it can pin them all
2. Mines work well enough when the blob ventures into your territory, but are useless otherwise. The German players will stop Allies advancing by setting up MG42's, the blob will move through the middle towards the allies. If the blob hits a mine and retreats, the allies will be pinned by the MG's when they follow.
3. Demo charges: see (2)
4. Mortars: Mostly useful against suppressed targets; see (1). Otherwise, they get vehicle-flanked or just suffer the same general problem facing blobbing as the rest of the allied army does
5. Kiting: Used to lure blobs into (1), (2), (3) and (4) - and therefore fraught with all the problems inherent to (1), (2), (3) and (4).
What a fucking joke. If the other player is going to invest all his resources into a push you are expected to invest more than one mg or one mine to counter it. You clearly don't know what kiting with vehicles is, if the only thing you think it's useful for is as bait.
So fuck off with the "MGs, arty, mines, demo charges, mortars, kiting" brain farting. And for gods' sake, learn how to fucking think! God, you drag the whole situation down when you spout so thoughtlessly and then everyone has to suffer for it.
I'm sorry you just wanted to have a whine thread instead of talking about solutions to improve how you play. I'm not sure how recommending good ways to counter a blob is dragging the situation down? Maybe you would prefer me to just yell about nerfing OKW or something? These are all good counters to blobbing, if you can't figure out how to make them work maybe the problem is on you and not the game.