Celtic Heroes

So my clan and I were bossing yesterday and I just don't get it.... To me there seemed to be more than a few kinks in the bosses. For example, we were about a quarter of the way through Chillmist and I had just logged in. Obviously I didn't have agro because I hadn't attacked even once. Somehow Chillmist decides to shed agro and one hit kill me out of nowhere. To top it when I respawned and attempted to attack it, I got one hit killed immediately every time I attacked once. Here's what I noticed happen: When we killed Uni I could cast my warrior skills from a far distance. When we killed Chillmist, the only way I could cast a skill was if I was practically on top of it. The skill cast distances were tremendous. Shouldn't this be relatively the same on all bosses? And here's the thing with Chillmist. If I landed on Giant Swing I was one hit killed immediately unless I hauled a** out as fast as I could. By having to cast one skill and then flee for my life, doesn't this defeat the purpose of warrior tanks? Along with that there was no real point for me to have been there because the amount of damage I contributed in the long run was so minimal compared to the mages. I would gander that this wisp boss problem would be the same for the others. Just seems odd to me is all...