I do love Mel and all of his movies. However, I really believe that Spaceballs was his last truly great film. I still enjoy Robin Hood: Men in Tights and Dracula: Dead and Loving It, but they seemed too much like specific parodies. Yes, they took aim at all the various films in their respective topics, but they didn't seem quite as good as his early work. A movie like Blazing Saddles is mentioned today mostly by the right leaning folks who whine about how "you couldn't make this movie today" (you could, because Mel was a genius and had a point, but you can't tell them than, because they think the PC police are hiding under their beds), but that film is genius for more than that. It points at the western genre as a whole, points out what's amusing about all of them, and then tackles the issue of racism, not only in the old west, but how it has seeped into the modern day. Young Frankenstein, while parodying the films, still has a very original take on the story, and is a brilliant film. History of the World Part I is a riot from beginning to end, and takes pot shots not only at history, but at historical epics in general. His last two films are the Mel Brooks equivalent of the (Fill-In-The-Blank) Movie parodies that plagued us for a little over a decade, where the "filmmakers" took a film or genre and just wrote jokes about it and filled the rest with current event jokes, which dated the films immediately. Brooks' films are 1000 times better than those, but just not on par with his early work.
Again, only my opinion. But I would rather sit and watch The Producers or Blazing Saddles over Robin Hood.