I was iLvl 73 for Syrcus Tower and people raged that my iLvl was too low?

[Felessan]

If the game lets you queue in DF for it your item level is sufficient to be there.

There was (intentionally) some room left for carry parties. But you can't expect other people to carry you and normally you should not behave in such a way.
My most infuriating experience in DF were when a tank decided that he can spiritbond in HM dungeons, and he went with the whole set, both right side (that I normally don't really care) and *left* side. Yes, he passed "minimum requirements" and I (as a healer) honestly tried to pull it off, but when he died from oneshot 3 times in a row, I told him goodbye.

If I'm there for armor I'll check out others on the same job to see what they are currently wearing so I know if I have competition. Also, people wear glamours a lot in ST so I sometimes check because of that. I'm not checking for ilvl, though. Mine is high enough that I'm not too concerned with anyone else's.

I sometimes check people who die a lot. Never complain though. Just for personal understanding whether people underequipped or underskilled.