Not big on the political satire approach.
For the most part, the new episodes are good, even though I'm in the camp that favors the original series. Aside the reality TV commentary, one thing that has really put me off of the new series is the attempt at political satire. I've read a quote by Mike Judge somewhere a while back that he doesn't like political humor, but that must've changed over the years because King of the Hill was started to get a little preachy at the end of its run, and then Judge created the failed The Goode Family show which was outright political satire. The new Beavis and Butt-head isn't completely centered around political humor, but there's been more than a few episodes that have addressed political issues (environmentalism, Evolution vs. Creationism, No Child Left Behind, military/war, etc.). To me, political issues seem to be completely out of place in Beavis and Butt-head. I consider myself a person with a lot of political opinions, and I really enjoy shows that can do political satire right, like South Park, but addressing political issues in Beavis and Butt-head really seems to undermine the sense of humor that made Beavis and Butt-head classic. Maybe Judge is trying to capitalize on shows that have had success with political humor like South Park and Family Guy? Who knows.
Not saying the new series is entirely unfunny. But I've found the episodes that don't involve political humor to be much funnier, such as The Rat, Crying, Daughter's Hand, etc. Those are more classic B&B to me. Oh, and on a side note, not big on pop culture satire either. I didn't find Werewolves of Highland very funny either for some reason.