I recently acquired Supernatural based on a few positive mentions here on KIA2. I quite like it, but it's a bit... off. These sorts of shows are really about the banter and camaraderie, with the monster stuff being almost incidental. Somehow the chemistry/banter is not quite working for me.
Should I persevere?
The first season is the best of the series, it has that horror element. The second one is good, you can make a case for season 3 and maybe 4 and then it has a very steep drop in quality. They had a success and wanted to milk it all the way. In the last seasons is incredibly bad, the story, the dialogue, everything. It still had a couple of good episodes but overall incredibly bad.
If the first season is not to your liking then there is no point in watching it. The banter gets a bit better and the relationship between the 2 evolves but it is just a bit better of the same.