I haven't done any rated pvp since Cataclysm where I hit 2463 on my Rogue. Missed Glad that season because the team owner decided to push on the last night with a new rogue / mage and tanked the team rating. Anyhow, I am looking to come back for Shadowlands and mage is appealing to me but I have never been great with casters in pvp. How hard should I expect it to be?