Undergeared HOX can be a frustration to play through because everything resists/dodges your attacks and you can't last more than a few seconds without the enemy CCd else you're dead.
Every class when geared doesn't blink an eye at any of the solo content. I'd say every class when played and the mechanics understood can work their way through the solo content too, to varying degrees.
Interestingly enough I think I could probably make bigger pulls on my full T4 HOX than I can on my full T4 Conqueror. The overwhelming hits actually brings down a Conq very quickly and they only live by virtue of Overcome the Odds. Once that is out it's trouble and Brute Conq's damage output, especially in the AOE department, isn't so great. Essentially it would be a fire weave banner which needs a 10 stack of FI to get up to power, retaliations and bloodbath AOE DOT. I know my HOX can pull an entire Wolves camp and survive which is maybe 10-20 people? Pull, Transform + Stun, Pillars for the DOT on everyone and instant 10 stack of flame lash, Inferno, Phoenix Cloak (possibly earlier or even precast) with HFB between and it's done. A quick fear scatters them if the damage is coming in too fast before your AOE eats them up.