Startrekwatcher
While I can certainly understand you choosing not to watch the show (and loosing interest in it), what I can't understand is this.
The show doesn't have the budget to be epic or do justice to their big bads anymore
The show has never, never had the money to showcase even monsters of the week effectively literally going back to Wendigo (when the producers came face to face with the short comings of the budget ability).
True that's why I never understood why the writers introduced seemingly epic storylines/ideas knowing they would never be able to truly do them justice. It only leads to disappointment. At least in the first 4 seasons(not surprisingly where what I consider the three best seasons come from)Azazel and Lilith and their threat was more manageable and better able to be executed--at least in my opinion.
but the show has just gotten formulaic and repetitive
Actually the show has always been formulaic. From the get go. In fact season 6 was the least formulaic to date of any season of SPN (doesn't mean it was a great season, but it was the least formulaic of SPN's history).
Maybe so but maybe I didn't notice it so much since the show was fresh and new in those early seasons--it seemed anything was possible. Season one was mostly standalones that existed for their own sake and entertaining. Azazel wasn't banished only to have a new threat appear after one season.
Now I know what to expect from being a longtime viewer so I feel like I'm going through the motions and so are the writers--even if Sam or Dean dies they don't stay dead, if Bobby is paralyzed he'll get his legs back, the season will have a mix of less than interesting standalones and more compelling heavy myth episodes, we'll get a comedy episode here and there, we'll have a big event right before winter hiatus, then back to Jan/Feb standalones, the guys will seek clues for the big monster of the season until they stumble upon some convenient fantastical macguffin that falls right into their laps(the show used to have more inventive ways to handling threats of the week), the big bad is vanquished, Sam and Dean keep things from each other, Sam and/or Dean is on the verge of a breakdown, are keeping things from each other, they get mad, one goes off on their own i.e. Dean to Lisa's before offering himself up to Michael or Sam to Ruby to develop his powers, they'll be one ot two meta episodes that break the fourth wall etc etc.
What was once fresh has just gotten stale for me. Season 4 was the show's pinnacle--season 5 showed cracks but I was willing to ride it out because Kripke had a 5 year plan. Now the CW is just dragging it out in my opinion.
From my own personal tv experience in the last decade it seems shows these days just burn bright then burn out quickly--they don't have the creative longevity as shows had pre-2000s--Heroes, BSG, Supernatural, Fringe etc