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I have never seen such squad wipes you're talking about, just a 3 men kill, but for that, many of my mines have been detected.
Oh it happens all right.
When playing as soviets I hardly ever notice these while playing (audio cue seems to unreliable here btw - anyone else notice this?).
I actually bother to watch the replays to check for squadwipes. Which is damn hard even for the mines I planted myself thanks to the antique replay system: no rewind.)
As a german player I have a hard time noticing this as well - I just get the audio cue of a lost squad (unless I see the actual explosion ofc).
I do not know if I made a mistake of ignoring an engagement and a squad burned in a molotov, ran with open arms into a shock trooper squad or just hit a mine.
The actual problem here is twofold:
Soviet mines are just awesome.
They butcher infantry and cripple tanks if detonated.
Soviets have no other worthwhile munitions sinks.
Persistent soviet infantry upgrades? Pull the other one, kid, it's got bells on!
As for molitovs:
With the new lethal small arms mechanics (which I adore, don't get me wrong) these are not viable in all firefights. Most of the time spamming molotovs just because you can is a dumb idea if you have to leave cover.