As said above, AV really steps up the difficulty on parties. Many, MANY DPS and tanks take unnecessary damage from the coincounter. And he hits like a truck, as well as adding some nasty paralyze effects if you get hit.

Don't sweat it. SCH takes a bit more effort to be really good at in high level content than WHM does. And good players will help you to learn, not rag on you because they think you are not very good.