You should be fine if you outgear/outlevel the instances. Once you get into Steamvaults/Shattered Halls, things just hit so hard that you'll be tearing your hair out instead of enjoying things. IMO, they're great if you don't try to instance. Just do PVP for gear and some of the easier instances for rep stuff. You'll lose out on badge gear but the PVP gear should be fine for everything else.