Alot of people seem to miss the main differance between the Guardian and the other warrior classes.
Most people consider tanking just soaking up the damage. I would say the shadow knight, paladin, and guardian are about the same in doing this. The guardian may have a tiny advantage but its nothing to write home about.
What everyone needs to realize is the main special ability of the guardian is to protect another character. Check the guardian skills. They include alot of nice skills such as instant pull of agro. No other class can walk into a fight and pull instant agro at the click of a button. If you look further you will see that the Guardian also has skills to block blows, parry, and take the damage aimed at another character in his/her group.
When it comes down to it the Guardian is like a bodyguard. He/She is a healers best friend.
Ever wondered why the programers pick the name Guard....ian. :smileywink:
The Woodpile