Leveler currently is not bad, but imho just lacks some "oomph". What I mean exactly is some riot stopping power. I wish that some of its power (as was in BA) of creating such a powerful explosion to make slow units loose their speed and stop briefly was brought back. There was simply an additional effect of an expulsion with an explosion which pushed nearby units a little. They were very fearsome in large numbers because of that effect.
Currently Scorcher vs Leveler 1v1 makes Leveler often loose, which is a bit counter intuitive. However 3 Levelers vs 4 Scorchers will always win (probably with some losses, depending on attack angle).
Also I never saw anyone using leveler to actually level ground.