If the Garand design was so good, why did none of the major powers adopt it's unique(?) features? It wouldn't fire semi-auto in a rain storm, thats hardly the stuff legends are made of. It was a good, robust MBR but their are alot of military rifles that can make the same claim to fame. As you say, the Garand was designed to fight WWI as was the BAR but the BAR outlasted the Garand didn't it?
Japan cloned the Garand but never got it into production. The Germans, like the USMC, thought riflemen would be prodigal with ammo and shied away from a semi-auto infantry rifle until later in the war.
Very early testing reported problems with rain soak, completely solved with the issue of Plastilube and the use of Lubriplate 130A, still on the market today as a water-resistant lubricant
The USMC evaluated rifles in December 1940 and officially picked the M1903 Springfield, but noted the Garand was servicable. None of the weapons tested, semiauto or not, did very well after being immersed in sand and salt water.
We couldn't produce enogh for our own needs before the war. But a large number of countries used the Garand after the war, including Italian produced rifles and Danish rifles. The Danish arsenal (VAR) produced many parts postwar into the 60's, including excellent barrels, and the Italians made receivers as well.
General Hatcher's "Book of the Garand" details the development of this amazing rifle, including the many development problems, and their solution.
When Garand-equipped Army units hit Quadalcanal to relieve the M1903-equipped Marines, the firepower and reliability the weapon delivered forced the Marine brass to drop their choice of the M1903 as their standard weapon. One would guess that the battle veterans of that tropical hellhole wouldn't be very enthusiastic about a rifle that wouldn' function in the rain, no?
The BAR was an amazing weapon, but both the BAR and Garand were replaced after Korea. Replacements for both were already being evaluated when Korea popped up.
Below - A Danish Naval Garand - note Anchor on sight cover