I am a healer and enjoy running dungeons with obviously new tanks. Some just don't understand their role's abilities yet. I've queued up to enter halfway through a dungeon and seen there's some obvious tension between the DDs and tank. No one goes in wanting to be a bad tank so I just roll with it, try to give suggestions, and calm the frustrations of the others. No one's perfect and there's a ton of pressure on the tank to keep hate when the DPS are both attacking random mobs. By the upper level dungeons most of the tanking I've seen has been pretty decent.

I agree most of the level 50s are power players grinding for gear. The friends I know will take the time to run low level dungeons over and over to help out friends. They haven't hit 50 yet. Give the community more time to mature.

There's also the option of joining a free company. If you can find a tight knit group I'm sure they'd love to bring in a new tank and help you learn your role better.