Well, I was that someone. I've seen every episode (and plan to catch up on those that I'm missing lately due to technical difficulties). I understand people being driven crazy by SV, because I frequently have been, but if you consider the show an AU/Elseworlds, you'll be much happier. :)
The show screwed up royally often, but gave me genuine entertainment for ten years. I stayed out of the 'shipping wars and like a bunch of 'ships from the show. The show had a vibrant fandom during the Clex years, and continues to thrive.
Smallville could have been great, but let's face it, the original producers were too busy falling in love with Kristin Kreuk to concentrate on Clark's story, but the show managed to give us joy even while we ground our teeth. :)
I criticize Smallville when I feel it deserves it, but most of the time I was absorbed for the whole hour every week, and don't consider it a trial to have watched it! Being a fan doesn't mean you don't criticize, but I sometimes wonder when people constantly bash something, why are they watching it?
I am proud to be a Smallville fan. Frankly, I think it's just considered chic to bash the show. I know I'm going to miss it when it's no longer airing new episodes. In terms of storytelling, it should have ended about three years ago (IMO it dragged out Clark's journey to Superman a little too long), but I'm still going to miss it. And think of how lucky we SV fans are having ten years of canon to play with! Compare that to shows with far less years or fans of movies that give you only two hours of canon!
So, I'm happy to have 'suffered' through the ten years, and will be writing more SV in the years ahead! :)