As common with the later WWII M1 Garand's, Winchester's were known to have a slightly rougher finish with more machine marks left.
The rifles were as good as any other, just with a slightly rougher finish.
Remember, the M1917 was first the British contract P14, and Winchester had to meet the demanding British standards.
Had Winchester been making substandard rifles, the Brits would have discovered it long before the US contracted for the M1917.
So, while you MIGHT notice a few more machine marks on non-critical surfaces, the Winchester M1917 was as good as the Remington or the Remington-Eddystone.
The reason for rumors about the Eddystone comes from a batch re-barreled during WWII.
The people doing the re-barreling did it incorrectly, and over-stressed the receiver.
Some of these were cracked, but due to the strength of the action, the rifles had no problems until people found the cracks years later.
As I recall, the barrels used were WWII Marlin replacements and that's what to watch for.