I think pre-50 dungeons are in a good spot. Leveling up if I had any complaints it would be dungeon length, some of my best times pugging were still pretty much 45+ minutes. And then dps are waiting 25 minutes on top of that. Also I think the guildleve trials need more work. When I leveled my alt DPS job, I rarly ran into a tank who knew what the hell he was doing. Tanks need more threat indicators and perhaps some on screen instructions on how to gain threat. Otherwise leveling dungeons were plentiful, offered lots of boss mechanics, and made it hard to steamroll while at the same time working in higher level players.

I do think things like shield of oath should be given atleast 10 levels lower. I find that making tanking harder at lower levels is not ideal for keeping players interested in playing as a tank.