Wild Romanian,
constant slamming of the weapons one dislikes does not an expert make. The US made and fielded in excess of seven million M1 and M2 Carbines; if they had reliability issues of the magnitude you describe, it would hardly be the most numerously produced infantry weapon in US history. Also, mine has worked fine with milsurp and commercial softpoint ammo, both with the 15- and 30-round magazine. If you and your pals had reliability issues, maybe you should invest in a good cleaning kit for your guns on the next trip to the gun store. Giving a review on guns is much like critique on books or plays...ripping the reviewed offering to shreds is much easier (and requires a lot less talent and subject knowledge) than offering a constructive, informed and qualified review.
I realize that the M1 Carbine is not the be-all and end-all of fighting rifles. It's not a battle rifle, nobody has ever claimed that status for it. It's merely been stated by many users, military and civilians, that the M1 Carbine is more than adequate (and in some instances even preferable over a full-sized battle rifle) for most combat situations. If you need to worry about body armor on your opponents in suburban America, chances are they are better equipped and trained than you even if you're wielding an AR-15 with a Beta-C mag full of green tip ammo. Let's leave the extreme scenarios to the "UN Invasion" crowd, most DGUs are not against kevlar-wearing vermin...and the ones that do are invariably decided on the side of the guys clad in black, every time.
Yes, they make carbines in .308 and .30-06, but they are invariably twice as heavy as the M1 Carbine and have increased recoil and muzzle blast over their full-sized counterparts. I gues it depends on whether you want to define carbine as "cut-down battle rifle" or "purpose-built reduced caliber rifle". Neither definition is incorrect, but don't define one by the standards of the other.
Oh, and one thing that always slays me is how 900fpe out of a carbine is "weak and anemic", and 900fpe out of a handgun is the Hammer of Thor. I guess all those foot-pounds out of the carbine are worthless because the bullet diameter is not the Holy Grail of perp slayers, the 0.45 inch.
WR, you don't like the M1 Carbine, I gathered that. You also don't like most other guns, and you've shot them all. Personally, it is my experience that folks with your professed pedigree usually drop the magazine when they try to take my M1 Carbine "off safe".