I'm also really wary of all the talk of Russian failure because it took over 2 weeks for the USA & Co to take Baghdad, despite the massive use of 'shock and awe', total air dominance and many years of crippling sanctions beforehand. And during that period, Russian-linked propaganda sources posing as daily news about the military situation loved to talk up the idea that the USAs invasion had stalled.
I think with Baghdad, they were approaching from one road from Kuwait, around a 600km journey. They were also being methodical with air strikes and so on.
By contrast, Russia (and Belarus) surrounds Ukraine from the North, East and South. Sumy and Kharkiv are a mere 50km from the border and Russia has failed to take them or even to encircle them successfully. Kyiv is only about 170km. They are yet to take Mariupol. Russia has also failed to gain air dominance. They have also likely already lost more men than the US lost over many years in Iraq and Afghanistan combined, and certainly more helicopters, planes, and tanks. Again, we don't have reliable figures, but it does appear likely that they have taken significant losses.
By contrast, it was only 20 days before the Americans had occupied Baghdad. It doesn't look likely that they will take Kyiv in a week from now, when they haven't even managed to encircle Sumy or Kharkiv.
And that's not to mention Russian economic collapse.
I appreciate the effort to retain some skepticism and avoid getting carried away - but I think it is also an error to trust too much that people in charge of operations have a good, well thought out plan and know what they are doing. History is replete with examples of people in similar positions to Putin making catastrophic misjudgements, and this looks like it is another one. Main misjudgement being that Russian speaking Ukrainians would welcome them, and that the government in Kyiv would flee.
It is possible that Russia can still win, but like I said - it won't be a Blitzkrieg, if Russia does win it is going to look a lot more like the war in Syria, a bloody war of attrition dragging on for years, than the relatively quick US occupation of Baghdad.
This can be inferred simply by the numbers. This isn't like the US occupation or Vietnam or Iraq, or the Soviet occupation of Afghanistan. Ukraine has almost a third of Russia's population, and Russia is no longer a great power economically - by population and economy, it is more comparable to Mexico than to the US, Soviet Union, China, or even India.
I think they could only have realistically achieved their maximal goals if Ukrainians welcomed them in large enough numbers, but that hasn't happened.