Apart from Toppling Charge being more of a Player versus Terrain affair than Player versus Player, it seems that this ability as well as Sweeps is near impossible to properly use even in medium latency situations. The gap closer will completely miss its target, often by rather wide margins, while the Sweeps animations barely play at all and actually hitting enemies (I was testing it on a bunch of guards) seems to be even harder. Trying to time light attacks between the Sweeps channels seems to be just as unreliable and broken. Talking to other Templars this seems to be par for the Templar course.
@ZOS_GinaBruno, these skills have had complaints about various stages of broken-ness for years, so are there any plans for improvements?