I've been like this since before TVTropes. Let's just say, I regret the day I ever thought it a good idea to watch a movie like Mafia! for a group date. My date and her friends enjoyed it, I called out every joke moments before impact to miles away, and I even resorted to riffing some jokes and thinking up better jokes that apparently were too esoteric for my simple-minded date and her friends (they were at least improvements on already bad jokes to make them so bad they were good). It turned out I was more annoying than the movie because I was the only one sick of it 1/8th of the way in.
In a sense, that far back is where I get my criticism of the Seltzer/Freidberg "movies" from. The only thing that would revive my respect for Leslie Nielsen, would be if he actually does a serious role in a movie completely out of the blue, and does it well. But since Airplane and the Naked Gun series and Hot Shots 1 (part deux sucked), it's just sad.
I think this is a reason I enjoy anime so much. Different media source, different direction/style. Some anime still continues to surprise me. Monster just rocked with all the twists placed throughout; and despite some call-outs, there were times I was either proven wrong, or was proven right, but because I recalled something beforehand several episodes back. Hell, Gurren Lagaan revived my Saturday Morning childhood feeling I used to have for certain shows, just by sheer awesomeness alone.
I never expected mecha to reach galactic scale, and still move unhindered. And I never expected a drill to be such an effective weapon. Furthermore, Kamina's death did actually have impact when I first watched it. He was just too awesome to die.
At least some shows, despite a predictability here and there, are still sorta fun to watch; like Doctor Who, some episodes of Stargate (SG-1 to Universe), Warehouse 13, and Fringe. Lost, despite some unpredictabilities, was actually rather easy to keep track of. Some old shows I used to watch also had some interesting watching, despite un/predictable portions. Lexx and Farscape were like this a whole lot. I mean sure, eventually Kai will take down His Shadow (as prophesied), but the methods used were not. Sure, the title ship destroys planets, but you didn't expect it to eat them as a source of food. Farscape had some surprise episodes too. I liked how the episode "I, Alien" went down. That was unexpected by far. And that was just first season. As for games, Starcon was always a total surprise every corner you come across in the game, and shifts genres subtly, but swiftly in due time.
Despite the spoiling TVTropes delivers sometimes; it does grant me interest in shows or media I didn't previously appreciate, that is until I read up on more detailed aspects (See- That One Boss, for seeking a crazy-hard battle, or remembering how kickass I was for beating such a boss before taking advantage of the internet and FAQs and etc.). That site can either ruin, or save your life (from boredom).
I think the Age of Monotony is soon ending. You know how some things skip a generation, this was a somewhat dull decade of creativity, what with 9/11 kicking it off and all, and politicians (or Family Guy) taking advantage of it, despite how long ago it was. I think the Reference-o-Matic 3000 is finally losing the peoples' interest, and creativity will rise up again. I mean, I'm starting to see some good stuff appear again. The Indie Age is a good sign of (semi-)original material rising up out of the ashes. Have faith.