So what if you have to spend mp on a unit to counter another? thats kind of how RTS's go. Thats like whining about loosing to Roaches in SCII when all you did was spam marines.
Here is the scope of which you are missing:
Soviet player spends resources on tech structure with little scaling (notice how snipers are literally the only unit out of this structure that has meaningful impact passed the 12 minute mark) and then buys a taxi for early wipes that cost fuel as well as manpower. Just like a kubel, an M3 is an early investment and if it does not manage to do anything meaning full they have literally been a waste. Kubels are esssentially dead after the 6 minute mark when other counters are about the map. Its the same principle, an M3 helps gain an early advantage that has to do work, other wise all it did was put the Soviet player behind.
With that in mind, Why is it such a huge deal to build a well scaling AT gun in the begining? its not like it will be utterly useless after the M3 dies unlike the M3 and the Kubel.
Of course you need infantry, but after the Kubel is delt with the game will be pretty even and even gain you a lead because the fuel put into the M3 will make it harder for them to counter an early Flack halftrack or luchs (I mean, its not like Soviets have Panzershrecks to push away armor)
You're not getting it. Try facing it 3/4 games.
When you have a Puepp you lack the inf you need.
The M3 can shut down or take out your Kubel very fast
It can flank all your defensive units.
It can chase down and wipe retreating squads with 3-4 men.
It's one of the most fun-killing units.
There is no need for a unit with armour and speed and the ability to carry units in the early game.
I'd rather see guards at T1 than that thing. But you'll never know why it's a problem 'cos you don't play against it. In any case you should stop saying it's all ok and post a replay of you proving it.
"With that in mind, Why is it such a huge deal to build a well scaling AT gun in the begining? its not like it will be utterly useless after the M3 dies unlike the M3 and the Kubel."
I already explained!!! it leaves you with a weaker army for a long time. That puepp is reducing MP all the time it is on the field too. It isn't needed for another 15 minutes after that. THAT's why it's a big deal.
The scope of what you are missing is immense. Play some axis then see how you feel.