There isn't really any solution to that, but that didn't keep killfiles from being invented anyway. Sure, when reading newsgroups I'd occasionally get a "jump discontinuity" as it skipped over a post, but that's more than made up for by the convenience of not having to skip over the other one in the first place. You get used to it after a while and, since the post you were just reading was a response to someone you've deemed lacking in any redeemable qualities, you probably weren't missing much anyway.
There actually aren't many people I'd plonk on TR (I can count them on one hand and still have fingers to spare), but it would still be a nice feature. Besides, killfiles (or ignore, which seems to be the less archaic term) are voluntary and up to the particular user. If you want to read every post by every person, more power to you. If you want to disregard posts by certain users, that would be up to you.
I like to read all posts in a discussion before posting, so I use the "Next" link to do this. However, I won't even bother reading discussions in which znkjryy rqvfba (<--name ROT13'ed to protect the stupid) participates because I have to click "Next" right through so many of his posts. It would be nice to be able to read a discussion without having to click 100 times unnecessarily.
But the actual clicking isn't so bad; it's the fact that TR tends to get a little unresponsive at times, so waiting for it to load a vacuous post 100 different times can add up to an hour of wasted time. Also, since the "Previous/Next" link is UNDER the post, it's not always in the same spot; it depends on the length of the message, so you almost always have to scroll or move the mouse to get to it. Maybe it's the engineer in me, but little things like this irk me.
I've always found rating posts to be useless. Even Slashdot's system, as multilayered as it is, is only one step above nothing at all.
Unfortunately, asking these kinds of individuals to stuff it usually just ends up adding two junk posts to the discussion: my request, and their "Now let me explain to you why I'm so mentally superior to you in every conceivable way, you Mensa peon" response.