I like being close to the action. As a melee fighter it is a much different perspective then fighting from afar. It is difficult to tell with Ultima Online but with other online games, it is quite evident. You see everything that is occurring, while the back line jobs maintain their distance since they cannot withstand repeated blows from the enemy.
Secondly, when I first started out all of the friends that I had played mages and other classes. It is an opportunity for a person to keep an enemies attention and hence, tank as it were.
I won't go into skill or high damage argument, but I like playing melee fighters as well because bar none...most every game you have a top damage dealer that is melee.
Whether called assassin, warrior, ranger, thief, dark knight or what have you...a properly geared melee fighter can put out faster damage over time then any other class.
The main argumentation and logic about the above statement is this:
1. I won't run out of arrows
2. I won't have to rest to replenish MP (the bane of every mage...it really is inevitable. At least if you are soloing).
Consequently, that leaves Melee fighter's. I like keeping the mobs attention and dealing large, consistent damage. That is why I play a melee fighter.