It's only at the end of 1944 Tula was able to fully meet all technical requirements / specifications for SVT-40 manufacture provided by designers. Since that no commissions /tests were able to find any issue with SVT-40. Having said that even all early SVT-40 were on par with any semi auto of that period, it's just commies did not want and were not able to train most conscripts to handle such a simple rifle. And most of modern users seem to be fine with amateur "my best guess how to take down SVT and adjust gas valve without unscrewing the piston" youtube videos. Thus "finicky and unreliable". Not for me for sure.