I'm actually really glad that, aside from dungeons, almost every piece of content in this game has followed a difficulty curve instead of staying static, usually you'd have the difficulty remain fairly static (or even get easier in the case of 3.4) so having things actually get harder as you progress through the various points of the expansion os really nice, it forces you to get better gradually while not necessarily dumping a really hard encounter on you out of nowhere.

If you have trouble with it you simply have to do the same thing you'd do in other games: keep practicing until you're good enough to beat it.