Neither thrill nor dread. I like my level and class based improvements predictable, and nobody wants to be screwed by low HD rolls, but it's not a huge deal to me. If I'm setting up something liable to take a lot of punishment, and am forced to roll, I set Con high enough that nothing but 1s for HD will still be survivable. Sure it's a nuisance having to take some points out of another ability score to do that, if I do, but it's just one more issue you work around when you're playing an actual game rather than theorycrafting.