People need to stop thinking about this in American terms. If this was an American invasion going this badly for something that wasn't an immediate existential threat, congress would take action to limit the President's power and force him to cease hostilities. They told people to be ready for thousands of losses in Desert Storm, but everyone knew how low Iraqi morale was.
Russians have kind of a bug person mentality. Not like the gooks, but enough that they're ok being cannon fodder, because their lives are pretty shitty, and they don't have the false hope of worthwhile social mobility that their American counterparts have. They know their lives will continue to be shitty, so they do parachute drops without air support. They roll their tanks through forests without scout vehicles, screening infantry, or loitering air support. They eat MREs that expired in 2001, and don't care that their officers skimmed money that was supposed to go to maintaining vehicles and weapons, because petty corruption is a part of life in Russia. They follow orders directly from command, and don't care that they're not given flexibility the way American officers are. They don't think about their supply lines being overextended, because someone else is supposed to think about that. This thinking dates back to the days of the Tsars, and then Communism solidified the bugmind. It's probably how the mind virus of bolshevism was able to infect the Russians so effectively, and the Chinks even more. You can see it in the Russo Japanese War. You can see it in how they fought in WW1. Only someone like Lenin could deliver the right false promises to get them to turn, and that was after years of horrific losses and poor morale.
They're not gooks, so when faced with utter hopelessness, they piss their pants and surrender or run if there's not a commissar behind them. But for every one that gets captured or desert, three or four are able to pummel the enemy or rush past them. Best bet to defeat them is to be in particularly difficult territory, like the Japanese in the Russo Japanese War, or the Finns in the Winter War. Ukraine is not an island with a warrior culture and equally potent bugmind. Nor is it a tundra with well educated and motivated people, supplied by the Nazis with good weapons . The Russians have invaded Ukraine four times in the 20th century if I remember correctly. They'll probably get a fifth, unless globochomo can stop them with economic warfare and information warfare, similar to how the Germans stopped them by releasing Lenin.
It's also typical for the early days of a Russian military operation to be wraught with incompetence. It's a survival of the fittest situation. They can lose enough troops, so that the ones who survive become battle hardened. They're like the .1% of germs Clorox can't kill. Their parents threw themselves into the shit at Chernobyl and Afghanistan. Their grandparents threw themselves upon Nazi Germany without question. Now it's their turn.
We shall see if things have changed enough to make it fail strategically. But tactically, the Russians are winning in classic Russian fashion.