Since there are SO many movies that have been riffed by MST3K and their offshoots, I began keeping a list of which ones I've watched and whether or not I liked them. I wrote all of these during the movies, so they're just quick thoughts on each movie.
These have tons of plot and joke "spoilers" including mentioning references that I like. I will almost never fail to mention Prince references or old TV show references like The Bob Newhart Show or Rockford Files. But mostly these were written as personal reminders of what the movie was about, and the stream-of-thought manner in which they are written reflects that.
However, I have no excuse for the haphazard way in which they are (not) organized. I will work on that at some point. Meanwhile, I have figured how to add .gifs! Now you can get the sensation of motion sickness while sitting still reading.
The way I have tried to rank these is in tiers.
Top Tier - These are my favorites episodes/riffs. Lots of MST3K seasons 4, 5, 6 and 11 are in this tier. Quite a few Cinematic Titanic Live and Rifftrax Live shows are also in this top tier. These are the best ones. I don't actually like rewatching things multiple times. I know I differ from most fans in this way, but these are the ones worth repeat viewings.
Second Tier - There isn't a ton of difference between Top and Second tier. These are still pretty funny, or have at least a few laugh out loud moments. But they just don't reach the "classic" status for me. I think MST702 The Brute Man is probably an example of an episode high in the 2nd tier
Third Tier - There IS a ton of difference between Third tier and the top two tiers. At the top of the third tier are the ones I am indifferent to. As you work down the list to the very bottom, some are embarrassingly unfunny and even make me angry because they are so aggressively bad. These are the ones that I will never ever sit through again. (Because they put out so many riffs, this tier has a disproportionate number of Rifftrax titles. It also contains almost all of season 12 of MST3K.)