There were many times where I would be trying to level (human) and get invaded. I would die, then go off as undead to try and level. I would rinse and repeat, getting invaded when I became human and dying (Cheating/better player/better gear I don't know). Then I would out level the area, and would be unable to get help with bosses without making forum posts and using chats to friends I had randomly met playing.
It was much more enjoyable/feasible to spend most time undead, some time human and jumping though boss fog when I wanted to live. I was able to manage it well. Now ... if you can not manage the invasions and it becomes a competition of e-peen prissys (which if you look at some posts here, it will be) because you can be invaded no matter what, and if you die while being invaded you get penalized, how is that even remotely fun?
I think the jury is still out on this.