Why is the war in Ukraine considered a Russian fiasco?

The narrative in the western world is that the war in Ukraine has been a fiasco for Russia; that they aren't doing as well as they should be, that their weaknesses have been exposed, that their military is much weaker than it was expected to be, etc.

And yet, the war has only been on-going for about a month, and Russia are fighting the biggest country in Europe. It's a modern country, with a well-equipped military, and a democratically elected leadership, meaning there is little internal insurgency and the people stand together against a common enemy.

So why is it that Russia is deemed to have done so badly so early in the conflict?