Game Mechanics: Channeling in general

[Dfn]

Had a druid melee interrupt my G.Heal 3 times in a row, just one melee hit. Then other times I channel a bomb through 15 hits.

It's w/e. Should have been an ogre if you wanted to interrupt someone. Or get some resists so you don't die from a channel. I don't want to get interrupted every time someone breathes on me.