I could maybe understand the criticism if Russia had made further gains, but you have to keep in mind that Ukraine has liberated 74,443 km² or 28,743 square miles since the start of the invasion. The offensive may not have had the effect that many hoped for after their earlier successes but they are facing defensive positions that have been set up and fortified over months. It will take some time to force a breakthrough and they are still constantly chipping away at the frontline. It’s a good thing that they are advancing carefully and not just sending expendable waves of untrained soldiers like the Russians do.