Earlier quoted context omitted.
Yes, that's actually the direction I was aiming for, a little bit like the Slashdot system. I just think it's very hard to choose meaningful adjectives/dimensions (the slashdot set also quickly feels limiting). That's why I'd start with the most basic sentiment(s) first (positive|negative, agree|disagree, ...), see how that goes, and possibly extend from there.
What do adjectives have to do with commenting?
As maxerickson said we'd have additional votes for adjectives like e.g. "mean", "interesting", "funny" and others, but the hard part would be to choose a meaningful set.
I think almost any set would probably feel arbitrary and limiting quickly, so I'd rather stick with very few, very basic ones and see how that goes.