Yeah my warrior was about 440ish at the time, same for DK, so not super high, but not in scrubby gear. Similar for the classes listed below.
Originally i was running it on 6 classes: Arms Warrior, Unholy DK, Shadow Priest, Enh Shaman and WW Monk and MM Hunter back when it was just released (because apparently I was a sucker for self punishment by doing the questline 6 times and doing assaults/visions x 6, probably explains whyI burned out after a few months)
Easy Tier: Arms Warrior, Unholy DK, Enh Shaman. Never had any trouble meting page requirements, and I was extremely early doing bonus obs. As soon as I got Orbs from the first run I was clearing 1-2 bonus obs on my warrior and DK. Played safe on my enh.
Medium: WW Monk - I found this harder than the others, but this mgiht be because my monk was geared primarily for BrM (I had WW Az but it was ST focused) but my stat weights were BrM favoured. WW is not my general palystyle.
Hard: MM Hunter and Priest. Hunter has improved since my clear has climbed to 462 ilevel, wth corruptions and near-optimal Az I can now delete packs pretty fast, bosses even quicker. Originally though, my progress was safe, but waaaaay slower than Arms, so much harder to get a full clear until my research strong-armed it.
I’ve found priest hard. I know other say it isn’t. Probably L2P issues with shadow (I main Disc) and not doing it the right way, but I found Shadow quite tricky to do it quickly and without risk- if I tried one, I tended to lose the other.
So yeah whilst my earlier post might make out that “everyone should be able to” that’s probably a bad way of stating it; it becomes a lot easier to full clear after EE, and it’s all some classes need to do it, others may need some more cloak levels or research because their ability to upkeep mobility, damage and sustain is worse.
Of the lsit i’ve found Arms the best imo. I very nearly full cleared before EE was researched, but would sanity out just before the final boss. I would be using flasks etc though, because I had tons of them from my alchemist getting a ridiculously lucky proc of 20 str flasks about week prior.