Of course, no disputing that. I just couldn't take either him or the old trisword seriously. I did use it on him when I'd pick it up from the shops, though. He just didn't need it, and it was what it was.
I think it's because of his simplicity and self-sustaniedness. Ability 1) You can't really die, except by accident. Ability 2) If someone tries to kill you you get about as much damage bonus as a rogue. Ability 3) If you use what allows you not to die you get even more damage, giving you the biggest damage in the game.
I mean, it's not that you don't have to prep stuff, or use stuff, but there is so little depth to him that you pretty much always use the same stuff, and the cauldron and the dragonsoul were the first things that made more stuff appealing to a warlord in a while. They actually made me pick him and take him places. The problem then was - he still couldn't die and had the biggest attack bonus in the game. It took me ages to learn to use him because what he was was so unbelievable that I kept making mistakes by expecting some sort of downside to jump out at me if I'm not careful. There isn't one, pretty much, as long as you stack mana/potions and bring a RBS.
Maybe it just looks that way because I play a lot of Mysterea. But I really can't tell what apart from the few things mentioned here has any appeal to warlords...