I guess you're just unlucky with the groups, or you're on a weird server. When I first hit level 50 I searched for wanderer's palace cause that was the only level 50 dungeon I had unlocked.
There I was with people with full ilvl 90 gear, and I'm there as their healer, ilvl 41... They weren't mad or anything! I made us wipe twice but they just said stuff like "maybe should've told you about the boss mechanics" and stuff like that.

So I'm sorry that you haven't had similar experience as a fresh 50