From my perspective, the most fun part is the frequent scenario pop on my lowbies. I find myself logging in my non 40s right now and having tons of fun. But I really, really, really look forward to running some balanced Redeemed premades to hunt us some destro game!
FYI, we don't have to limit ourselves to 6 ppl Qing anymore. Lions use an add on called Queue Queuer that does its best to coordinate a full warband to join a scenario together. It's not perfect but tells you which groups in the warband get into the scenarios. I have the add on installed and recommend ppl get it.