What do you guys think about ultra greatswords in PVE (well the various weapon classes in general actually)?
I'm not sure I see the point in most situations. I mean, I have both the BK GS and BK UGS, both at +5 and both fire-infused (both have innate fire damage as well), and I'm pretty sure the regular GS has better overall DPS due to the faster swings.
In situations where I get surrounded (like the annoying exploding mummies), I find the regular GS to have better utility, as the faster swings are able to keep enemies at bay with less risk of getting stunned while I'm in the middle of a swing.
One case that comes to mind where I would go with the UGS instead is against Lion Warriors, where the UGS would have a better chance of one-hitting them on a backstab. With most other enemies, I can attack them head-on by waiting for them to drop their guard and swinging the regular GS at them before they can get their attacks off (sometimes with the Rock Ring equipped).