I genuinely like both, but I think Seasons 1-5 of Supernatural are some of the best of that genre of TV. It's melodramatic because it's a CW show at its heart, but it's got enough funny/touching/action moments to keep you invested. The "monster of the week" episodes are better than the meta episodes, in my opinion, but there's enough building of the central plots that it makes sense at least, and the initial 'finale' was a good bittersweet ending.
Now past Season 5? You're dealing with the execs forcing them to pump out episodes because people were still watching it in high numbers, so don't expect the world there. There were occasionally some diamond in the rough episodes, even then.
If you're going to watch Supernatural, I recommend the blu-ray versions. The streaming ones lost the music licenses and had to add in a bunch of royalty free butt rock, which surprisingly kills off a major part of the show.