What are you comparing it to? Russia has never invaded a country like this. There's no book on how wars like this are fought, we are learning as it happens.Something definetely smells fishy. No mass artillery attacks, no mass tank attacks, no massive infantry attacks, no.massive air attacks etc. No massive anything.
It doesn't seem to be what a proper general offensive to invade a country is supposed to be. Its more of probing attacks than anything else
The closest comparison we have is the Iraq war 2, which was NATO operating their own strategy. Even that took 6 weeks.