Not sure why Mr. McFeely would be offered a cameo...

So are they getting better at this then?

yes and no. i mean, if you saw the entire roadhouse star trek 5 rifftraxx, you might say they are getting worse. however, they are getting more consistent. remember, it took mst3k three season (including the public access season) to actually get funny (seriously, the public access and first two seasons were god awful) so despite the fact that they ought to know how to do this by now, i'd give them a bit more time to get into their groove.

I saw this in the theater with some friends. When the Thing told the kids "don't do drugs," one of them yelled "or you'll end up like me: stoned all the time!" That was a much better line than the one they used here. But then again I can't really fault them for not having the perfect retort for evey single line of dialogue.

That's a horrible insult to the thing.

If we didn't know who was doing these, they would never make it through the hopper.