I believe the biggest issue with tanking is threat. In my opinion, tanks shouldn't have to stress over threat. It's not unreasonable to have to work for it a bit, but in order to grab threat and keep it, you have to be near flawless. I won't even mention the fact that Warriors don't have access to a TAUNT unless they level up a gladiator. I know cross-class skills are a big part of this game - but locking down probably the most important ability to tanking classes in MMOs is ridiculous.
Instead of having tanks focus on holding threat, why not look into having them focus on active mitigation? It's a much more intelligent and fun system where you're reacting to enemy damage and using the proper abilities to counter it, rather than staring at a threat meter all day.
Don't get me wrong - I enjoy a challenge, and I enjoy tanking. When it's
fun.
Longer version due to char limit:
http://pastebin.com/dReX7GcF