Its easy - imagine massive, gargantuan corruption. On all levels, including the very top and going all the way to the lowest soldier. Heck, they were selling gas to Belarus civilians from their own machines while waiting just across the border during February. And then they ran out of it in Ukraine.
Can you imagine US or western Europe soldiers doing something similar en masse?
And its not just that - heavy drinking, fuck-it attitude, and suddenly called to invade the nation who was supposed to be their closest brothers?
They are sort of potemkin village kind of army. Few exceptional units (Spetsnaz), few cool technologies ie anti aircraft missiles, literally maybe 10 new Armata tanks (they found out they can't manufacture them en masse). So you see 40-50 years old tanks which Javelin can fry easily, and even clueless civilian can fire them after 30 minutes of training. You see soldiers abandoning vehicles since they have higher survability on foot. You see tank crew coming to Ukrainian police station to ask where is gas station (I call it clever way to surrender).
I think its actually very dangerous for Russia as a state right now. Showing this much weakness might motivate some neighbors. Especially China, they could run through the country all the way to Barents sea without breaking a sweat.