Ian from Forgotten Weapons actually considers the Model 38 Carcanos to be among the best World War II rifles built from the standpoint that they were simple, inexpensive, judges the fixed sights as a concession to realistic combat where most rifleman couldn't hit much of anything beyond 2-300 yards/meters, and that the 6.5 and 7.35mm rounds were more like modern intermediate rounds.
I will agree with the fixed sights not being ideal (the Finns, who received almost 200K 7.35mm Carcano rifles and carbines, certainly thought so). Even modern rifles like the HK416/417 and the SCAR 16/17 have adjustable sights on them (rear only for HKs, front and rear for the SCAR). Though in fairness, the iron sights are meant as back ups for optics, but that's not quite the point here.
For sure, the Breda Model 30 IMO is probably the worst automatic weapon ever made IMO. Even the Chauchat (at least the 8mm Lebel versions) were better.