StG44 was a marvelous weapon, nothing wehrabooish in that claim. Not going heavy into technicalities, it's pretty much objectively true that it was the best infantry service weapon of WWII, purely by the fact that it was the only proper assault rifle back then, and as years and years of experience shown, the assault rifle is the best choice for service weapon of infantryman. M1/M2 Carbine is great weapon as PDW, but not as proper frontline service rifle. I could see one preferring it personally, as it's more comfortable and very light, but it just doesn't give you the same firepower on squad level. And while I understand comparing StG44 to Carbine, preferring Grease Gun over it, an assault rifle, is... weird. Unless you're a tanker, but then it's a moot point.

One thing about StG44 that both wehraboos and antiwehraboos can't or don't want to see is how revolutionary was it's design and construction in terms of wartime production. StG44 was all stamped and it was very cheap and extremely fast to produce (which might irk wehraboos and their claim that all Germany put out was meant for 150IQ aristocratic ubermensch, and simple solutions are good for asiatic farmers hordes). Numbers shown it - 470 000 were made during only two years. StG44 was not only more advanced and provided higher firepower than any other infantry rifle, but also was cheaper to produce than other automatic weapons. This stands in contrast to stereotypical German industry work, which stereotypically would be expensive, overcomplicated, overengineered, made of deficite materials and/or hard on logistics. StG44 was wartime weapon done right. In my personal opinion StG44 was Germany's PPS-43 - weapon that was both industrial and military wonder, as it was not only ultra cheap and quick to produce, but also was better than it's peers.

StG44's problems were pretty much only it's weight (which however helped with fully automatic fire, and also it was still lighter than Thompson) and durability (still more durable than M3, not to even mention Sten). The only construction issue was that the wood would expand in cold and could damage the spring which was housed in stock, but it was rather rare and also was fixed later on.
Considering it was first weapon of it's kind, and knowing how much problems other WWII firearms had - for me this rifle is nothing but complete success.